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/* $Id: modern.c 76 2024-09-29 19:08:51Z nishi $ */

#include "rv_query.h"

#include "rv_util.h"
#include "rv_version.h"
#include "rv_auth.h"
#include "rv_db.h"
#include "rv_repo.h"
#include "rv_multipart.h"

#include "../../config.h"

#ifdef USE_ENSCRIPT
#include "rv_enscript.h"
#endif

#ifdef USE_AVATAR
#include "rv_avatar.h"
#endif

#ifdef USE_GRAPHICSMAGICK
#include "rv_magick.h"
#endif

#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

extern char* nocache;
extern char* buffer;
void add_data(char** data, const char* txt);
void render_stuff();

char* title = NULL;
char* desc = NULL;
char* page = NULL;
char* nav = NULL;
char* logopath = NULL;
char* grepouser;
extern char* user;

bool invalid_char(char c) {
        if(c >= '0' && c <= '9') return false;
        if(c >= 'a' && c <= 'z') return false;
        if(c >= 'A' && c <= 'Z') return false;
        if(c == '_' || c == '-' || c == '.') return false;
        return true;
}

char* url_escape(const char* input) {
        const char hex[] = "0123456789ABCDEF";
        char* r = malloc(1);
        r[0] = 0;
        char cbuf[2];
        cbuf[1] = 0;
        int i;
        for(i = 0; input[i] != 0; i++) {
                if(input[i] == 0x20 || input[i] == 0x22 || input[i] == 0x25 || input[i] == 0x2d || input[i] == 0x2e || input[i] == 0x3c || input[i] == 0x3e || input[i] == 0x5c || input[i] == 0x5e || input[i] == 0x5f || input[i] == 0x60 || input[i] == 0x7b || input[i] == 0x7c || input[i] == 0x7d || input[i] == 0x7e || input[i] == 0x21 || input[i] == 0x23 || input[i] == 0x24 || input[i] == 0x26 || input[i] == 0x27 || input[i] == 0x28 || input[i] == 0x29 || input[i] == 0x2a || input[i] == 0x2b || input[i] == 0x2c || input[i] == 0x2f || input[i] == 0x3a || input[i] == 0x3b || input[i] == 0x3d || input[i] == 0x3f || input[i] == 0x40 || input[i] == 0x5b || input[i] == 0x5d) {
                        add_data(&r, "%");
                        cbuf[0] = hex[(input[i] >> 4) & 0xf];
                        add_data(&r, cbuf);
                        cbuf[0] = hex[input[i] & 0xf];
                        add_data(&r, cbuf);
                } else {
                        cbuf[0] = input[i];
                        add_data(&r, cbuf);
                }
        }
        return r;
}

char* html_escape(const char* input) {
        char* r = malloc(1);
        r[0] = 0;
        char cbuf[2];
        cbuf[1] = 0;
        int i;
        for(i = 0; input[i] != 0; i++) {
                if(input[i] == '<') {
                        add_data(&r, "&lt;");
                } else if(input[i] == '>') {
                        add_data(&r, "&gt;");
                } else if(input[i] == '&') {
                        add_data(&r, "&amp;");
                } else {
                        cbuf[0] = input[i];
                        add_data(&r, cbuf);
                }
        }
        return r;
}

char* html_escape_nl_to_br(const char* input) {
        char* r = malloc(1);
        r[0] = 0;
        char cbuf[2];
        cbuf[1] = 0;
        int i;
        for(i = 0; input[i] != 0; i++) {
                if(input[i] == '<') {
                        add_data(&r, "&lt;");
                } else if(input[i] == '>') {
                        add_data(&r, "&gt;");
                } else if(input[i] == '\n') {
                        add_data(&r, "<br>");
                } else {
                        cbuf[0] = input[i];
                        add_data(&r, cbuf);
                }
        }
        return r;
}

int fcounter = 0;
char* instead_username = NULL;
void list_repo(const char* name, const char* rev) {
        char* showname = html_escape(name);
        char* urluser = url_escape(instead_username == NULL ? user : instead_username);
        char* urlrepo = url_escape(name);
        add_data(&page, "<tr style=\"background-color: #");
        if((fcounter % 2) == 0) {
                add_data(&page, "D2E1C0");
        } else {
                add_data(&page, "FFFFFF");
        }
        fcounter++;
        add_data(&page, "\"><td><a href=\"");
        add_data(&page, INSTANCE_ROOT);
        add_data(&page, "/?page=repo&reponame=");
        add_data(&page, urlrepo);
        add_data(&page, "&username=");
        add_data(&page, urluser);
        add_data(&page, "\">");
        add_data(&page, showname);
        add_data(&page, "</a></td>");
        add_data(&page, "<td>");
        add_data(&page, rev);
        add_data(&page, "</td>");
        add_data(&page, "</tr>");
        free(showname);
        free(urluser);
        free(urlrepo);
}

void list_files(const char* pathname) {
        if(fcounter == 0) {
                add_data(&nav, "<li><a href=\"#filelist\">File List</a></li>\n");
                add_data(&page, "<h2 id=\"filelist\">File List</h2>\n");
                add_data(&page, "<tr style=\"background-color: #D2E1F6;\"><th>Name</th><th>Size</th></tr>\n");
                char* path = rv_get_query("path");
                if(path == NULL) path = "/";
                if(strcmp(path, "/") != 0) {
                        char* query = rv_strdup("?page=repo&reponame=");
                        char* esc;
                        esc = url_escape(rv_get_query("reponame"));
                        add_data(&query, esc);
                        free(esc);
                        add_data(&query, "&username=");
                        esc = url_escape(rv_get_query("username"));
                        add_data(&query, esc);
                        free(esc);
                        add_data(&query, "&path=");

                        char* urlpath = rv_strdup(path);
                        int i;
                        int counter = 0;
                        int rep = urlpath[strlen(urlpath) - 1] == '/' ? 2 : 1;
                        for(i = strlen(urlpath) - 1; i >= 0; i--) {
                                char oldc = urlpath[i];
                                urlpath[i] = 0;
                                if(oldc == '/') {
                                        counter++;
                                        if(counter == 2) {
                                                break;
                                        }
                                }
                        }

                        if(strlen(urlpath) == 0) {
                                free(urlpath);
                                urlpath = rv_strdup("/");
                        }

                        esc = url_escape(urlpath);
                        add_data(&query, esc);
                        free(esc);

                        add_data(&page, "<tr><td><a href=\"");
                        add_data(&page, query);
                        add_data(&page, "\">../</a></td><td>&lt;DIR&gt;</td></tr>\n");
                        fcounter++;
                        free(query);
                }
        }
        fcounter++;
        add_data(&page, "<tr style=\"background-color: #");
        if((fcounter % 2) == 0) {
                add_data(&page, "D2E1C0");
        } else {
                add_data(&page, "FFFFFF");
        }
        char* path = rv_get_query("path");
        if(path == NULL) path = "/";
        char* query = rv_strdup("?page=repo&reponame=");
        char* esc;
        esc = url_escape(rv_get_query("reponame"));
        add_data(&query, esc);
        free(esc);
        add_data(&query, "&username=");
        esc = url_escape(rv_get_query("username"));
        add_data(&query, esc);
        free(esc);
        add_data(&query, "&path=");
        char* urlpath = rv_strcat3(path, "/", pathname);
        esc = url_escape(urlpath);
        add_data(&query, esc);
        free(esc);
        char* sz = malloc(128);
        sprintf(sz, "%lld", rv_get_filesize(grepouser, urlpath));
        add_data(&page, "\"><td><a href=\"");
        add_data(&page, query);
        add_data(&page, "\">");
        esc = html_escape(pathname);
        add_data(&page, esc);
        free(esc);
        add_data(&page, "</a></td>\n");
        add_data(&page, "<td>\n");
        if(strcmp(sz, "-1") != 0) {
                add_data(&page, sz);
        } else {
                add_data(&page, "&lt;DIR&gt;");
        }
        add_data(&page, "</td>\n");
        free(sz);
        add_data(&page, "</tr>\n");
        free(query);
        free(urlpath);
}

void generate_avatar(void) {
        if(user != NULL) {
                char* tmp = rv_strcat3(AVATAR_ROOT, "/", user);
                char* path = rv_strcat(tmp, ".png");
                free(tmp);
                if(access(path, F_OK) != 0) {
                        rv_avatar_generate(path, user);
                }
                free(path);
        }
        if(rv_get_query("username") != NULL && rv_has_user(rv_get_query("username"))) {
                char* un = rv_get_query("username");
                char* tmp = rv_strcat3(AVATAR_ROOT, "/", un);
                char* path = rv_strcat(tmp, ".png");
                free(tmp);
                if(access(path, F_OK) != 0) {
                        rv_avatar_generate(path, un);
                }
                free(path);
        }
}

void render_page(void) {
        rv_load_query('Q');
        char* query = rv_get_query("page");
        if(query == NULL) query = "welcome";

#ifdef USE_AVATAR
        generate_avatar();
#endif

        if(strcmp(query, "welcome") == 0) {
                title = rv_strdup("Welcome");
                desc = rv_strdup("Welcome to " INSTANCE_NAME ".");
                page = rv_strcat3("Welcome to " INSTANCE_NAME ".<br>This instance is running RepoView version ", rv_get_version(), ".");
#ifdef ALLOW_SIGNUP
        } else if(strcmp(query, "signup") == 0) {
                title = rv_strdup("Signup");
                desc = rv_strdup("You can create your account here.");
                page = rv_strdup("");

                add_data(&page, "<form action=\"");
                add_data(&page, INSTANCE_ROOT);
                add_data(&page, "/?page=sendsignup\" method=\"POST\">\n");
                add_data(&page, "       <table border=\"0\">\n");
                add_data(&page, "               <tr>\n");
                add_data(&page, "                       <th>Username</th>\n");
                add_data(&page, "                       <td>\n");
                add_data(&page, "                               <input name=\"username\">\n");
                add_data(&page, "                       </td>\n");
                add_data(&page, "               </tr>\n");
                add_data(&page, "               <tr>\n");
                add_data(&page, "                       <th>Password</th>\n");
                add_data(&page, "                       <td>\n");
                add_data(&page, "                               <input name=\"password\" type=\"password\">\n");
                add_data(&page, "                       </td>\n");
                add_data(&page, "               </tr>\n");
                add_data(&page, "       </table>\n");
                char cbuf[2];
                cbuf[0] = REPO_USER_DELIM;
                cbuf[1] = 0;
                add_data(&page, "Username cannot contain '<code>");
                add_data(&page, cbuf);
                add_data(&page, "</code>'.<br>");
                add_data(&page, "       <input type=\"submit\" value=\"Signup\">\n");
                add_data(&page, "</form>\n");
        } else if(strcmp(query, "sendsignup") == 0) {
                title = rv_strdup("Signup Result");
                page = rv_strdup("");

                rv_load_query('P');
                if(user != NULL) {
                        page = rv_strdup("It looks like you are already logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=logout\">log out</a>?\n");
                } else if(rv_get_query("username") == NULL || rv_get_query("password") == NULL) {
                        add_data(&page, "Invalid form.\n");
                } else {
                        if(rv_has_user(rv_get_query("username"))) {
                                add_data(&page, "User already exists.");
                        } else {
                                if(user != NULL) free(user);
                                int i;
                                bool reject = false;
                                char* name = rv_get_query("username");
                                for(i = 0; name[i] != 0; i++) {
                                        if(name[i] == REPO_USER_DELIM || invalid_char(name[i])) {
                                                char cbuf[2];
                                                cbuf[0] = REPO_USER_DELIM;
                                                cbuf[1] = 0;
                                                add_data(&page, "Username cannot contain '<code>");
                                                add_data(&page, cbuf);
                                                add_data(&page, "</code>'.");
                                                reject = true;
                                                break;
                                        }
                                }
                                if(!reject) {
                                        rv_create_user(rv_get_query("username"), rv_get_query("password"));
                                        user = rv_strdup(rv_get_query("username"));
                                        add_data(&page, "Welcome.\n");
                                        rv_save_login(rv_get_query("username"));
                                }
                        }
                }
#endif
        } else if(strcmp(query, "login") == 0) {
                title = rv_strdup("Login");
                desc = rv_strdup("You can log in to your account here.");
                page = rv_strdup("");

                add_data(&page, "<form action=\"");
                add_data(&page, INSTANCE_ROOT);
                add_data(&page, "/?page=sendlogin\" method=\"POST\">\n");
                add_data(&page, "       <table border=\"0\">\n");
                add_data(&page, "               <tr>\n");
                add_data(&page, "                       <th>Username</th>\n");
                add_data(&page, "                       <td>\n");
                add_data(&page, "                               <input name=\"username\">\n");
                add_data(&page, "                       </td>\n");
                add_data(&page, "               </tr>\n");
                add_data(&page, "               <tr>\n");
                add_data(&page, "                       <th>Password</th>\n");
                add_data(&page, "                       <td>\n");
                add_data(&page, "                               <input name=\"password\" type=\"password\">\n");
                add_data(&page, "                       </td>\n");
                add_data(&page, "               </tr>\n");
                add_data(&page, "       </table>\n");
                add_data(&page, "       <input type=\"submit\" value=\"Login\">\n");
                add_data(&page, "</form>\n");
        } else if(strcmp(query, "sendlogin") == 0) {
                title = rv_strdup("Login Result");
                page = rv_strdup("");

                rv_load_query('P');
                if(user != NULL) {
                        page = rv_strdup("It looks like you are already logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=logout\">log out</a>?\n");
                } else if(rv_get_query("username") == NULL || rv_get_query("password") == NULL) {
                        add_data(&page, "Invalid form.\n");
                } else {
                        if(rv_has_user(rv_get_query("username"))) {
                                if(rv_check_password(rv_get_query("username"), rv_get_query("password"))) {
                                        if(user != NULL) free(user);
                                        user = rv_strdup(rv_get_query("username"));
                                        add_data(&page, "Welcome back.\n");
                                        rv_save_login(rv_get_query("username"));
                                } else {
                                        add_data(&page, "Invalid password.");
                                }
                        } else {
                                add_data(&page, "User does not exist.");
                        }
                }
        } else if(strcmp(query, "sendlogout") == 0) {
                title = rv_strdup("Logout Result");
                page = rv_strdup("");
                if(user == NULL) {
                        add_data(&page, "You were not logged in.\n");
                } else {
                        rv_logout();
                        add_data(&page, "Goodbye.\n");
                        free(user);
                        user = NULL;
                }
#ifdef USE_MYPAGE
        } else if(strcmp(query, "mypage") == 0) {
                title = rv_strdup("My Page");
                desc = rv_strdup("You manage your information here.");
                if(user == NULL) {
                        page = rv_strdup("It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else {
                        page = rv_strdup("");
                        nav = rv_strdup("");
                        add_data(&nav, "<li><a href=\"#youricon\">Your Icon</a></li>\n");
                        add_data(&nav, "<li><a href=\"#bio\">Bio</a></li>\n");
                        add_data(&page, "<form action=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=upload\" method=\"POST\" enctype=\"multipart/form-data\">\n");
                        add_data(&page, "       <h2 id=\"youricon\">Your Icon</h2>\n");
                        add_data(&page, "       <a href=\"");
                        add_data(&page, WWW_AVATAR_ROOT);
                        add_data(&page, "/");
                        add_data(&page, user);
                        add_data(&page, ".png\"><img src=\"");
                        add_data(&page, WWW_AVATAR_ROOT);
                        add_data(&page, "/");
                        add_data(&page, user);
                        add_data(&page, ".png");
                        add_data(&page, "\" alt=\"Your Icon\" width=\"50%\"></a><br>");
                        add_data(&page, "       <input type=\"file\" name=\"pfp\">\n");
                        add_data(&page, "       <h2 id=\"bio\">Bio</h2>\n");
                        add_data(&page, "       <textarea name=\"bio\" style=\"width: 100%;resize: none;height: 128px;\">\n");
                        char* path = rv_strcat3(BIO_ROOT, "/", user);
                        FILE* f = fopen(path, "r");
                        if(f != NULL) {
                                struct stat s;
                                stat(path, &s);
                                char* biobuf = malloc(s.st_size + 1);
                                fread(biobuf, 1, s.st_size, f);
                                biobuf[s.st_size] = 0;

                                char* esc = html_escape(biobuf);
                                add_data(&page, esc);
                                free(esc);

                                free(biobuf);
                                fclose(f);
                        }
                        free(path);
                        add_data(&page, "</textarea>\n");
                        add_data(&page, "       <input type=\"submit\" value=\"Send\">\n");
                        add_data(&page, "</form>\n");
                }
#endif
#ifdef USE_AVATAR
        } else if(strcmp(query, "upload") == 0) {
                title = rv_strdup("Uploading My Page Result");
                page = rv_strdup("");
                if(user == NULL) {
                        add_data(&page, "It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else {
                        struct multipart_entry* entry = rv_get_multipart("pfp");
                        if(entry != NULL && entry->length > 0) {
                                char* tmp = rv_strcat3(AVATAR_ROOT, "/", user);
                                char* path = rv_strcat(tmp, ".tmp");
                                char* outpath = rv_strcat(tmp, ".png");
                                free(tmp);
                                FILE* f = fopen(path, "wb");
                                fwrite(entry->data, 1, entry->length, f);
                                fclose(f);
                                char* reason;
                                if(rv_resize_picture(path, outpath, &reason)) {
                                        add_data(&page, "Uploaded the profile picture successfully.<br>\n");
                                } else {
                                        add_data(&page, "Failed to upload the profile picture.<br><code>\n");
                                        char* esc = html_escape(reason);
                                        add_data(&page, esc);
                                        free(esc);
                                        add_data(&page, "</code>\n");
                                        free(reason);
                                }
                                free(path);
                                free(outpath);
                        }
                        entry = rv_get_multipart("bio");
                        if(entry != NULL) {
                                char* path = rv_strcat3(BIO_ROOT, "/", user);
                                FILE* f = fopen(path, "w");
                                fwrite(entry->data, 1, entry->length, f);
                                fclose(f);
                                free(path);
                                add_data(&page, "Uploaded the bio successfully.<br>\n");
                        }
                }
#endif
        } else if(strcmp(query, "myrepo") == 0) {
                title = rv_strdup("My Repositories");
                desc = rv_strdup("You manage your repositories here.");
                if(user == NULL) {
                        page = rv_strdup("It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else {
                        char cbuf[2];
                        cbuf[0] = REPO_USER_DELIM;
                        cbuf[1] = 0;
                        nav = rv_strdup("");
                        add_data(&nav, "<li><a href=\"#createrepo\">Create a repository</a></li>\n");
                        add_data(&nav, "<li><a href=\"#repolist\">Repository List</a></li>\n");
                        page = rv_strdup("");
                        add_data(&page, "<h2 id=\"createrepo\">Create a repository</h2>\n");
                        add_data(&page, "<form action=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=createrepo\" method=\"POST\">\n");
                        add_data(&page, "       <table border=\"0\">\n");
                        add_data(&page, "               <tr>\n");
                        add_data(&page, "                       <th>Repository name</th>\n");
                        add_data(&page, "                       <td>\n");
                        add_data(&page, "                               <input name=\"name\">\n");
                        add_data(&page, "                       </td>\n");
                        add_data(&page, "                       <td><input type=\"submit\" value=\"Create\"></td>\n");
                        add_data(&page, "               </tr>\n");
                        add_data(&page, "       </table>\n");
                        add_data(&page, "Repository name cannot contain '<code>");
                        add_data(&page, cbuf);
                        add_data(&page, "</code>'.");
                        add_data(&page, "</form>\n");
                        add_data(&page, "<h2 id=\"repolist\">Repository List</h2>\n");
                        add_data(&page, "<table border=\"0\" style=\"width: 100%;\">\n");
                        add_data(&page, "<tr style=\"background-color: #D2E1F6;\"><th>Repository name</th><th>Revision</th></tr>\n");
                        fcounter = 0;
                        rv_repo_list(user, list_repo);
                        add_data(&page, "</table>\n");
                }
        } else if(strcmp(query, "createrepo") == 0) {
                title = rv_strdup("Creating Repository Result");
                page = rv_strdup("");

                rv_load_query('P');
                if(user == NULL) {
                        page = rv_strdup("It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else if(rv_get_query("name") == NULL) {
                        add_data(&page, "Invalid form.\n");
                } else {
                        int i;
                        bool reject = false;
                        char* name = rv_get_query("name");
                        for(i = 0; name[i] != 0; i++) {
                                if(name[i] == REPO_USER_DELIM || invalid_char(name[i])) {
                                        char cbuf[2];
                                        cbuf[0] = REPO_USER_DELIM;
                                        cbuf[1] = 0;
                                        add_data(&page, "Repository name cannot contain '<code>");
                                        add_data(&page, cbuf);
                                        add_data(&page, "</code>'.");
                                        reject = true;
                                        break;
                                }
                        }
                        if(!reject) {
                                char* ru = rv_construct_repouser(name, user);
                                if(rv_repo_exists(ru)) {
                                        add_data(&page, "Repository already exists.");
                                } else {
                                        char* esc;
                                        rv_create_repo(ru);
                                        add_data(&page, "Repository has been created.<br>\n");
                                        add_data(&page, "<a href=\"");
                                        add_data(&page, INSTANCE_ROOT);
                                        esc = url_escape(name);
                                        add_data(&page, "/?page=repo&reponame=");
                                        add_data(&page, esc);
                                        free(esc);
                                        esc = url_escape(user);
                                        add_data(&page, "&username=");
                                        add_data(&page, esc);
                                        free(esc);
                                        add_data(&page, "\">Go to the repository</a>.\n");
                                }
                                free(ru);
                        }
                }
        } else if(strcmp(query, "logout") == 0) {
                title = rv_strdup("Logout");
                desc = rv_strdup("You can log out from your account here.");
                if(user == NULL) {
                        page = rv_strdup("It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else {
                        page = rv_strdup("");
                        add_data(&page, "Are you sure you want to log out?\n");
                        add_data(&page, "<form method=\"POST\" action=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=sendlogout\">\n");
                        add_data(&page, "       <input type=\"submit\" value=\"Yes\">\n");
                        add_data(&page, "</form>\n");
                }
        } else if(strcmp(query, "repo") == 0) {
                title = rv_strdup("Repository");
                desc = rv_strdup("");
                page = rv_strdup("");
                nav = rv_strdup("");
                rv_load_query('Q');
                if(rv_get_query("username") == NULL || rv_get_query("reponame") == NULL) {
                        add_data(&page, "Required parameters not set.");
                } else {
                        char* ruser = rv_get_query("username");
                        char* repo = rv_get_query("reponame");
                        char* repouser = rv_construct_repouser(repo, ruser);
                        grepouser = repouser;
                        if(rv_repo_exists(repouser)) {
                                char* showuser = html_escape(ruser);
                                char* showrepo = html_escape(repo);
                                char* showreadme = rv_get_readme(repouser);
                                desc = html_escape_nl_to_br(showreadme);
                                add_data(&title, " - ");
#ifdef USE_MYPAGE
                                add_data(&title, "<a href=\"");
                                add_data(&title, INSTANCE_ROOT);
                                add_data(&title, "/?page=person&username=");
                                char* esc = url_escape(ruser);
                                add_data(&title, esc);
                                free(esc);
                                add_data(&title, "\">");
#endif
                                add_data(&title, showuser);
#ifdef USE_MYPAGE
                                add_data(&title, "</a>");
#endif
                                add_data(&title, "/");
                                add_data(&title, showrepo);
                                free(showuser);
                                free(showrepo);
                                free(showreadme);
#ifdef WWW_SVN_ROOT
                                add_data(&nav, "<li><a href=\"#repoinfo\">Info</a></li>\n");
                                add_data(&page, "<h2 id=\"repoinfo\">Info</h2>\n");
                                add_data(&page, "<a href=\"");
                                add_data(&page, WWW_SVN_ROOT);
                                add_data(&page, "/");
                                char* escru = url_escape(repouser);
                                add_data(&page, escru);
                                free(escru);
                                add_data(&page, "\">Raw repository</a>");
#endif

                                int isdir;
                                char* path = rv_get_query("path");
                                if(path == NULL) path = "/";
                                fcounter = 0;
                                add_data(&page, "<table border=\"0\" style=\"width: 100%;\">");
                                bool rej = false;
                                if(!rv_get_list(repouser, path, list_files, &isdir)) {
                                        add_data(&page, "<tr><td>Path not found.</td></tr>\n");
                                        rej = true;
                                }
                                add_data(&page, "</table>");
                                if(isdir == 0 && !rej) {
                                        add_data(&nav, "<li><a href=\"#filecontent\">Content</a></li>");
                                        add_data(&page, "<h2 id=\"filecontent\">Content</h2>\n");
                                        add_data(&page, "<pre class=\"codeblock\"><code>");
#ifdef USE_ENSCRIPT
                                        int i;
                                        char* ext = NULL;
                                        for(i = strlen(path) - 1; i >= 0; i--) {
                                                if(path[i] == '.') {
                                                        ext = path + i + 1;
                                                        break;
                                                }
                                        }
                                        char* data = rv_enscript(repouser, path, ext);
                                        if(data != NULL) {
                                                add_data(&page, data);
                                                free(data);
                                        } else {
                                                data = rv_read_file(repouser, path);
                                                if(data != NULL) {
                                                        char* esc = html_escape_nl_to_br(data);
                                                        add_data(&page, esc);
                                                        free(esc);
                                                        free(data);
                                                } else {
                                                        add_data(&page, "Cannot open the file.\n");
                                                }
                                        }
#else
                                        char* data = rv_read_file(repouser, path);
                                        if(data != NULL) {
                                                char* esc = html_escape_nl_to_br(data);
                                                add_data(&page, esc);
                                                free(esc);
                                                free(data);
                                        } else {
                                                add_data(&page, "Cannot open the file.\n");
                                        }
#endif
                                        add_data(&page, "</code></pre>");
                                }
                                if(user != NULL && strcmp(user, ruser) == 0) {
                                        char* esc;
                                        add_data(&nav, "<li><a href=\"#managerepo\">Manage The Repository</a></li>\n");
                                        add_data(&page, "<h2 id=\"managerepo\">Manage The Repository</h2>\n");
                                        add_data(&page, "<form action=\"");
                                        add_data(&page, INSTANCE_ROOT);
                                        add_data(&page, "/?page=sendmanrepo&username=");
                                        esc = url_escape(ruser);
                                        add_data(&page, esc);
                                        free(esc);
                                        add_data(&page, "&reponame=");
                                        esc = url_escape(repo);
                                        add_data(&page, esc);
                                        free(esc);
                                        add_data(&page, "\" method=\"POST\">\n");
                                        add_data(&page, "<table border=\"0\" style=\"width: 100%;\">\n");
                                        add_data(&page, "       <tr>\n");
                                        add_data(&page, "               <th>README</th>\n");
                                        add_data(&page, "               <td>\n");
                                        add_data(&page, "                       <textarea name=\"readme\" style=\"width: 100%;resize: none;height: 128px;\">\n");
                                        char* readme = rv_get_readme(repouser);
                                        esc = html_escape(readme);
                                        add_data(&page, esc);
                                        free(esc);
                                        free(readme);
                                        add_data(&page, "</textarea>\n");
                                        add_data(&page, "               </td>\n");
                                        add_data(&page, "       </tr>\n");
                                        add_data(&page, "</table>\n");
                                        add_data(&page, "<input type=\"submit\" value=\"Send\">\n");
                                        add_data(&page, "</form>\n");
                                        add_data(&page, "<a href=\"");
                                        add_data(&page, INSTANCE_ROOT);
                                        add_data(&page, "/?page=deleterepo&username=");
                                        esc = url_escape(ruser);
                                        add_data(&page, esc);
                                        free(esc);
                                        add_data(&page, "&reponame=");
                                        esc = url_escape(repo);
                                        add_data(&page, esc);
                                        free(esc);
                                        add_data(&page, "\">\n");
                                        add_data(&page, "Delete repository\n");
                                        add_data(&page, "</a>\n");
                                }
                        } else {
                                add_data(&page, "Repository does not exist.\n");
                        }
                        free(repouser);
                }
        } else if(strcmp(query, "deleterepo") == 0) {
                title = rv_strdup("Delete The Repository");
                page = rv_strdup("");

                rv_load_query('Q');
                if(user == NULL) {
                        add_data(&page, "It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else if(rv_get_query("username") == NULL || rv_get_query("reponame") == NULL) {
                        add_data(&page, "Invalid Form.\n");
                } else {
                        char* esc;
                        add_data(&page, "Are you sure you want to delete the repository?\n");
                        add_data(&page, "<form method=\"POST\" action=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=senddeleterepo&username=");
                        esc = url_escape(rv_get_query("username"));
                        add_data(&page, esc);
                        free(esc);
                        add_data(&page, "&reponame=");
                        esc = url_escape(rv_get_query("reponame"));
                        add_data(&page, esc);
                        free(esc);
                        add_data(&page, "\">");
                        add_data(&page, "       <input type=\"submit\" value=\"Yes\">\n");
                        add_data(&page, "</form>\n");
                }
        } else if(strcmp(query, "senddeleterepo") == 0) {
                title = rv_strdup("Deleting Repository Result");
                page = rv_strdup("");

                rv_load_query('Q');
                if(user == NULL) {
                        add_data(&page, "It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else if(rv_get_query("username") == NULL || rv_get_query("reponame") == NULL) {
                        add_data(&page, "Invalid Form.\n");
                } else if(strcmp(rv_get_query("username"), user) != 0) {
                        add_data(&page, "You are not the owner of the repository.\n");
                } else {
                        char* repouser = rv_construct_repouser(rv_get_query("reponame"), rv_get_query("username"));
                        if(rv_repo_exists(repouser)) {
                                rv_remove_repo(repouser);
                                add_data(&page, "Deleted the repository successfully.<br>\n");
                        } else {
                                add_data(&page, "Repository does not exist.<br>\n");
                        }
                }
        } else if(strcmp(query, "person") == 0) {
                title = rv_strdup("Person");
                page = rv_strdup("");
                nav = rv_strdup("");

                rv_load_query('Q');
                if(rv_get_query("username") == NULL) {
                        add_data(&page, "Invalid Form.\n");
                } else {
                        if(rv_has_user(rv_get_query("username"))) {
                                add_data(&nav, "<li><a href=\"#repolist\">Repository List</a></li>");
                                add_data(&title, " - ");
                                add_data(&title, rv_get_query("username"));
                                char* path = rv_strcat3(BIO_ROOT, "/", rv_get_query("username"));
                                FILE* f = fopen(path, "r");
                                if(f != NULL) {
                                        struct stat s;
                                        stat(path, &s);
                                        char* buf = malloc(s.st_size + 1);
                                        fread(buf, 1, s.st_size, f);
                                        buf[s.st_size] = 0;

                                        desc = html_escape_nl_to_br(buf);

                                        fclose(f);
                                }

                                char* tmp = rv_strcat3(WWW_AVATAR_ROOT, "/", rv_get_query("username"));
                                logopath = rv_strcat(tmp, ".png");
                                free(tmp);

                                free(path);

                                add_data(&page, "<h2 id=\"repolist\">Repository List</h2>\n");
                                add_data(&page, "<table border=\"0\" style=\"width: 100%;\">\n");
                                add_data(&page, "<tr style=\"background-color: #D2E1F6;\"><th>Repository name</th><th>Revision</th></tr>\n");
                                fcounter = 0;
                                instead_username = rv_get_query("username");
                                rv_repo_list(rv_get_query("username"), list_repo);
                                instead_username = NULL;
                                add_data(&page, "</table>\n");
                        } else {
                                add_data(&page, "User does not exist.\n");
                        }
                }
        } else if(strcmp(query, "sendmanrepo") == 0) {
                title = rv_strdup("Modifying Repository Result");
                page = rv_strdup("");

                rv_load_query('Q');
                if(user == NULL) {
                        add_data(&page, "It looks like you are not logged in.<br>Want to <a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "/?page=login\">log in</a>?\n");
                } else if(rv_get_query("username") == NULL || rv_get_query("reponame") == NULL) {
                        add_data(&page, "Invalid Form.\n");
                } else if(strcmp(rv_get_query("username"), user) != 0) {
                        add_data(&page, "You are not the owner of the repository.\n");
                } else {
                        char* esc;
                        rv_load_query('P');
                        char* readme = rv_get_query("readme");
                        if(readme != NULL) {
                                rv_load_query('Q');
                                char* name = rv_construct_repouser(rv_get_query("reponame"), rv_get_query("username"));
                                rv_set_readme(name, readme);
                                free(name);
                        }
                        rv_load_query('Q');
                        add_data(&page, "Modified the repository successfully.<br>\n");
                        add_data(&page, "<a href=\"");
                        add_data(&page, INSTANCE_ROOT);
                        add_data(&page, "?page=repo&username=");
                        esc = url_escape(rv_get_query("username"));
                        add_data(&page, esc);
                        free(esc);
                        add_data(&page, "&reponame=");
                        esc = url_escape(rv_get_query("reponame"));
                        add_data(&page, esc);
                        free(esc);
                        add_data(&page, "\">Go back to the repository</a>.\n");
                }
        }

        if(title == NULL) title = rv_strdup("");
        if(desc == NULL) desc = rv_strdup("");
        if(page == NULL) page = rv_strdup("");
        if(nav == NULL) nav = rv_strdup("");

#ifdef USE_AVATAR
        generate_avatar();
#endif

        render_stuff();
freeall:
        free(page);
        free(desc);
        free(title);
        free(nav);
        if(logopath != NULL) free(logopath);
}

char* escape(const char* str) {
        char* r = malloc(1);
        r[0] = 0;
        char cbuf[2];
        cbuf[1] = 0;
        int i;
        for(i = 0; str[i] != 0; i++) {
                if(str[i] == '<') {
                        char* tmp = r;
                        r = rv_strcat(tmp, "&lt;");
                        free(tmp);
                } else if(str[i] == '>') {
                        char* tmp = r;
                        r = rv_strcat(tmp, "&gt;");
                        free(tmp);
                } else {
                        cbuf[0] = str[i];
                        char* tmp = r;
                        r = rv_strcat(tmp, cbuf);
                        free(tmp);
                }
        }
        return r;
}

void render_stuff(void) {
        char* escaped;
        char cbuf[2];
        cbuf[1] = 0;
        add_data(&buffer, "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">\n");
        add_data(&buffer, "<html>\n");
        add_data(&buffer, "     <head>\n");
        add_data(&buffer, "             <meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\">\n");
        add_data(&buffer, "             <title>");
        add_data(&buffer, INSTANCE_NAME);
        add_data(&buffer, " - ");
        int i;
        bool br = false;
        for(i = 0; title[i] != 0; i++){
                if(title[i] == '<'){
                        br = true;
                }else if(title[i] == '>'){
                        br = false;
                }else if(!br){
                        cbuf[0] = title[i];
                        add_data(&buffer, cbuf);
                }
        }
        add_data(&buffer, "</title>\n");
        add_data(&buffer, "             <style type=\"text/css\">\n");
        add_data(&buffer, "* {\n");
        add_data(&buffer, "     padding: 0;\n");
        add_data(&buffer, "     margin: 0;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "li {\n");
        add_data(&buffer, "     list-style: outside;\n");
        add_data(&buffer, "     margin-left: 1.25em;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "a {\n");
        add_data(&buffer, "     text-decoration: none;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#nav div {\n");
        add_data(&buffer, "     float: left;\n");
        add_data(&buffer, "     margin: 0 0;\n");
        add_data(&buffer, "     padding-left: 0;\n");
        add_data(&buffer, "     padding-right: 25px;\n");
        add_data(&buffer, "     padding-top: 7px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "th,td {\n");
        add_data(&buffer, "     padding: 2px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "body {\n");
        add_data(&buffer, "     background-color: #1F4677;\n");
        add_data(&buffer, "     width: 940px;\n");
        add_data(&buffer, "     margin: 5px auto;\n");
        add_data(&buffer, "     font-family: sans-serif;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#nav {\n");
        add_data(&buffer, "     background-color: white;\n");
        add_data(&buffer, "     background-image: url('");
        add_data(&buffer, INSTANCE_NAVBAR);
        add_data(&buffer, "');\n");
        add_data(&buffer, "     height: 44px;\n");
        add_data(&buffer, "     padding: 8px;\n");
        add_data(&buffer, "     padding-left: 32px;\n");
        add_data(&buffer, "     font-size: 22px;\n");
        add_data(&buffer, "     font-weight: bold;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "pre {\n");
        add_data(&buffer, "     background-color: #dddddd;\n");
        add_data(&buffer, "     border: solid 2px #bbbbbb;\n");
        add_data(&buffer, "     padding: 8px;\n");
        add_data(&buffer, "     overflow: scroll;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#index {\n");
        add_data(&buffer, "     list-style: none;\n");
        add_data(&buffer, "     line-height: normal;\n");
        add_data(&buffer, "     margin: auto 0;\n");
        add_data(&buffer, "     padding-left: 0;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#desc {\n");
        add_data(&buffer, "     background-color: #D2E1F6;\n");
        add_data(&buffer, "     margin: 9px auto;\n");
        add_data(&buffer, "     height: 128px;\n");
        add_data(&buffer, "     padding: 24px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#descinside {\n");
        add_data(&buffer, "     float: left;\n");
        add_data(&buffer, "     width: 700px;\n");
        add_data(&buffer, "     overflow-y: scroll;\n");
        add_data(&buffer, "     max-height: 128px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#logo {\n");
        add_data(&buffer, "     float: right;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#content {\n");
        add_data(&buffer, "     background-color: #FFFFFF;\n");
        add_data(&buffer, "     margin: -10px auto;\n");
        add_data(&buffer, "     padding: 8px 24px 24px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#pageindex {\n");
        add_data(&buffer, "     background-color: #FFFFFF;\n");
        add_data(&buffer, "     padding-right: 24px;\n");
        add_data(&buffer, "     padding-bottom: 24px;\n");
        add_data(&buffer, "     float: left;\n");
        add_data(&buffer, "     border-right: 4px #1F4677 solid;\n");
        add_data(&buffer, "     width: 150px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#pagecontent {\n");
        add_data(&buffer, "     background-color: #FFFFFF;\n");
        add_data(&buffer, "     width: 670px;\n");
        add_data(&buffer, "     float: right;\n");
        add_data(&buffer, "     padding-left: 24px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#footer {\n");
        add_data(&buffer, "     background-color: #D2E1F6;\n");
        add_data(&buffer, "     padding: 8px 8px 48px;\n");
        add_data(&buffer, "     margin: 8px auto;\n");
        add_data(&buffer, "     font-size: 15px;\n");
        add_data(&buffer, "     height: 32px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, ".fixfloat {\n");
        add_data(&buffer, "     clear: both;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#copyright {\n");
        add_data(&buffer, "     float: right;\n");
        add_data(&buffer, "     font-size: 10px;\n");
        add_data(&buffer, "     margin-top: 16px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "#gotop {\n");
        add_data(&buffer, "     position: absolute;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "h2, h3 {\n");
        add_data(&buffer, "     padding-top: 8px;\n");
        add_data(&buffer, "     padding-bottom: 8px;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "img {\n");
        add_data(&buffer, "     border: none;\n");
        add_data(&buffer, "}\n");
        add_data(&buffer, "             </style>\n");
        add_data(&buffer, "     </head>\n");
        add_data(&buffer, "     <body>\n");
        add_data(&buffer, "             <div id=\"nav\">\n");
        add_data(&buffer, "                     <div>\n");
        add_data(&buffer, "                             <a href=\"");
        add_data(&buffer, INSTANCE_ROOT);
        add_data(&buffer, "/\">Home</a>\n");
        add_data(&buffer, "                     </div>\n");
        if(user == NULL) {
                add_data(&buffer, "                     <div>\n");
                add_data(&buffer, "                             <a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=login\">Login</a>\n");
                add_data(&buffer, "                     </div>\n");
#ifdef ALLOW_SIGNUP
                add_data(&buffer, "                     <div>\n");
                add_data(&buffer, "                             <a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=signup\">Signup</a>\n");
                add_data(&buffer, "                     </div>\n");
#endif
        } else {
#ifdef USE_MYPAGE
                add_data(&buffer, "                     <div>\n");
                add_data(&buffer, "                             <a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=mypage\">My Page</a>\n");
                add_data(&buffer, "                     </div>\n");
#endif

                add_data(&buffer, "                     <div>\n");
                add_data(&buffer, "                             <a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=myrepo\">My Repositories</a>\n");
                add_data(&buffer, "                     </div>\n");

                add_data(&buffer, "                     <div>\n");
                add_data(&buffer, "                             <a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=logout\">Logout</a>\n");
                add_data(&buffer, "                     </div>\n");
        }
        if(user != NULL) {
#ifdef USE_AVATAR
#ifdef USE_MYPAGE
                add_data(&buffer, "<a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=person&username=");
                add_data(&buffer, user);
                add_data(&buffer, "\">");
#endif
                add_data(&buffer, "<img src=\"");
                add_data(&buffer, WWW_AVATAR_ROOT);
                add_data(&buffer, "/");
                add_data(&buffer, user);
                add_data(&buffer, ".png\" alt=\"Your Icon\" style=\"float: right;height: 32px;\">");
#ifdef USE_MYPAGE
                add_data(&buffer, "</a>");
#endif
#endif
                add_data(&buffer, "<div style=\"clear: both;float: right;font-size: 10px;padding-right: 0;font-style: italic;padding-top: 0;\">You have logged in as <a href=\"");
                add_data(&buffer, INSTANCE_ROOT);
                add_data(&buffer, "/?page=mypage\">");
                add_data(&buffer, user);
                add_data(&buffer, "</a></div>");
        }
        add_data(&buffer, "             </div>\n");
        add_data(&buffer, "             <div id=\"desc\">\n");
        add_data(&buffer, "                     <div id=\"descinside\">\n");
        add_data(&buffer, "                             <h1>");
        add_data(&buffer, title);
        add_data(&buffer, "</h1>\n");
        add_data(&buffer, "                             <p>\n");
        add_data(&buffer, desc);
        add_data(&buffer, "                             </p>\n");
        add_data(&buffer, "                     </div>\n");
        add_data(&buffer, "                     <img id=\"logo\" src=\"");
        if(logopath != NULL) {
                add_data(&buffer, logopath);
        } else {
                add_data(&buffer, INSTANCE_LOGO);
        }
        add_data(&buffer, "\" height=\"128px\" alt=\"logo\">\n");
        add_data(&buffer, "             </div>\n");
        add_data(&buffer, "             <div id=\"content\">\n");
        add_data(&buffer, "                     <div id=\"pageindex\">\n");
        add_data(&buffer, "                             <h3>Page Menu</h3>\n");
        add_data(&buffer, "                             <ul>\n");
        add_data(&buffer, nav);
        add_data(&buffer, "                             </ul>\n");
        add_data(&buffer, "                     </div>\n");
        add_data(&buffer, "                     <div id=\"pagecontent\">\n");
        add_data(&buffer, page);
        add_data(&buffer, "                     </div>\n");
        add_data(&buffer, "                     <div class=\"fixfloat\"></div>\n");
        add_data(&buffer, "             </div>\n");
        add_data(&buffer, "             <div id=\"footer\">\n");
        add_data(&buffer, "                     <div id=\"gotop\">\n");
        add_data(&buffer, "                             <a href=\"#top\">Top</a>\n");
        add_data(&buffer, "                     </div>\n");
        add_data(&buffer, "                     <div id=\"copyright\">\n");
        add_data(&buffer, "                             ");
        escaped = escape(INSTANCE_ADMIN);
        add_data(&buffer, escaped);
        free(escaped);
        add_data(&buffer, "\n");
        add_data(&buffer, "                     </div>\n");
        add_data(&buffer, "                     <div class=\"fixfloat\"></div>\n");
#ifdef INSTANCE_BANNERS
        add_data(&buffer, "                     <div id=\"banners\" style=\"clear: both;\">\n");
        add_data(&buffer, INSTANCE_BANNERS);
        add_data(&buffer, "                     </div>\n");
#else
        add_data(&buffer, "                     <div class=\"fixfloat\"></div>\n");
#endif
        add_data(&buffer, "             </div>\n");
        add_data(&buffer, "     </body>\n");
        add_data(&buffer, "</html>\n");
        if(user != NULL) free(user);
}