ui-plain.c

   1 /* ui-plain.c: functions for output of plain blobs by path
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10 #include "ui-plain.h"
  11 #include "html.h"
  12 #include "ui-shared.h"
  13
  14 struct walk_tree_context {
  15         int match_baselen;
  16         int match;
  17 };
  18
  19 static int print_object(const struct object_id *oid, const char *path)
  20 {
  21         enum object_type type;
  22         char *buf, *mimetype;
  23         unsigned long size;
  24
  25         type = oid_object_info(the_repository, oid, &size);
  26         if (type == OBJ_BAD) {
  27                 cgit_print_error_page(404, "Not found", "Not found");
  28                 return 0;
  29         }
  30
  31         buf = read_object_file(oid, &type, &size);
  32         if (!buf) {
  33                 cgit_print_error_page(404, "Not found", "Not found");
  34                 return 0;
  35         }
  36
  37         mimetype = get_mimetype_for_filename(path);
  38         ctx.page.mimetype = mimetype;
  39
  40         if (!ctx.repo->enable_html_serving) {
  41                 html("X-Content-Type-Options: nosniff\n");
  42                 html("Content-Security-Policy: default-src 'none'\n");
  43                 if (mimetype) {
  44                         /* Built-in white list allows PDF and everything that isn't text/ and application/ */
  45                         if ((!strncmp(mimetype, "text/", 5) || !strncmp(mimetype, "application/", 12)) && strcmp(mimetype, "application/pdf"))
  46                                 ctx.page.mimetype = NULL;
  47                 }
  48         }
  49
  50         if (!ctx.page.mimetype) {
  51                 if (buffer_is_binary(buf, size)) {
  52                         ctx.page.mimetype = "application/octet-stream";
  53                         ctx.page.charset = NULL;
  54                 } else {
  55                         ctx.page.mimetype = "text/plain";
  56                 }
  57         }
  58         ctx.page.filename = path;
  59         ctx.page.size = size;
  60         ctx.page.etag = oid_to_hex(oid);
  61         cgit_print_http_headers();
  62         html_raw(buf, size);
  63         free(mimetype);
  64         free(buf);
  65         return 1;
  66 }
  67
  68 static char *buildpath(const char *base, int baselen, const char *path)
  69 {
  70         if (path[0])
  71                 return fmtalloc("%.*s%s/", baselen, base, path);
  72         else
  73                 return fmtalloc("%.*s/", baselen, base);
  74 }
  75
  76 static void print_dir(const struct object_id *oid, const char *base,
  77                       int baselen, const char *path)
  78 {
  79         char *fullpath, *slash;
  80         size_t len;
  81
  82         fullpath = buildpath(base, baselen, path);
  83         slash = (fullpath[0] == '/' ? "" : "/");
  84         ctx.page.etag = oid_to_hex(oid);
  85         cgit_print_http_headers();
  86         htmlf("<html><head><title>%s", slash);
  87         html_txt(fullpath);
  88         htmlf("</title></head>\n<body>\n<h2>%s", slash);
  89         html_txt(fullpath);
  90         html("</h2>\n<ul>\n");
  91         len = strlen(fullpath);
  92         if (len > 1) {
  93                 fullpath[len - 1] = 0;
  94                 slash = strrchr(fullpath, '/');
  95                 if (slash)
  96                         *(slash + 1) = 0;
  97                 else {
  98                         free(fullpath);
  99                         fullpath = NULL;
 100                 }
 101                 html("<li>");
 102                 cgit_plain_link("../", NULL, NULL, ctx.qry.head, ctx.qry.oid,
 103                                 fullpath);
 104                 html("</li>\n");
 105         }
 106         free(fullpath);
 107 }
 108
 109 static void print_dir_entry(const struct object_id *oid, const char *base,
 110                             int baselen, const char *path, unsigned mode)
 111 {
 112         char *fullpath;
 113
 114         fullpath = buildpath(base, baselen, path);
 115         if (!S_ISDIR(mode) && !S_ISGITLINK(mode))
 116                 fullpath[strlen(fullpath) - 1] = 0;
 117         html("  <li>");
 118         if (S_ISGITLINK(mode)) {
 119                 cgit_submodule_link(NULL, fullpath, oid_to_hex(oid));
 120         } else
 121                 cgit_plain_link(path, NULL, NULL, ctx.qry.head, ctx.qry.oid,
 122                                 fullpath);
 123         html("</li>\n");
 124         free(fullpath);
 125 }
 126
 127 static void print_dir_tail(void)
 128 {
 129         html(" </ul>\n</body></html>\n");
 130 }
 131
 132 static int walk_tree(const struct object_id *oid, struct strbuf *base,
 133                 const char *pathname, unsigned mode, void *cbdata)
 134 {
 135         struct walk_tree_context *walk_tree_ctx = cbdata;
 136
 137         if (base->len == walk_tree_ctx->match_baselen) {
 138                 if (S_ISREG(mode) || S_ISLNK(mode)) {
 139                         if (print_object(oid, pathname))
 140                                 walk_tree_ctx->match = 1;
 141                 } else if (S_ISDIR(mode)) {
 142                         print_dir(oid, base->buf, base->len, pathname);
 143                         walk_tree_ctx->match = 2;
 144                         return READ_TREE_RECURSIVE;
 145                 }
 146         } else if (base->len < INT_MAX && (int)base->len > walk_tree_ctx->match_baselen) {
 147                 print_dir_entry(oid, base->buf, base->len, pathname, mode);
 148                 walk_tree_ctx->match = 2;
 149         } else if (S_ISDIR(mode)) {
 150                 return READ_TREE_RECURSIVE;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int basedir_len(const char *path)
 157 {
 158         char *p = strrchr(path, '/');
 159         if (p)
 160                 return p - path + 1;
 161         return 0;
 162 }
 163
 164 void cgit_print_plain(void)
 165 {
 166         const char *rev = ctx.qry.oid;
 167         struct object_id oid;
 168         struct commit *commit;
 169         struct pathspec_item path_items = {
 170                 .match = ctx.qry.path,
 171                 .len = ctx.qry.path ? strlen(ctx.qry.path) : 0
 172         };
 173         struct pathspec paths = {
 174                 .nr = 1,
 175                 .items = &path_items
 176         };
 177         struct walk_tree_context walk_tree_ctx = {
 178                 .match = 0
 179         };
 180
 181         if (!rev)
 182                 rev = ctx.qry.head;
 183
 184         if (get_oid(rev, &oid)) {
 185                 cgit_print_error_page(404, "Not found", "Not found");
 186                 return;
 187         }
 188         commit = lookup_commit_reference(the_repository, &oid);
 189         if (!commit || parse_commit(commit)) {
 190                 cgit_print_error_page(404, "Not found", "Not found");
 191                 return;
 192         }
 193         if (!path_items.match) {
 194                 path_items.match = "";
 195                 walk_tree_ctx.match_baselen = -1;
 196                 print_dir(get_commit_tree_oid(commit), "", 0, "");
 197                 walk_tree_ctx.match = 2;
 198         }
 199         else
 200                 walk_tree_ctx.match_baselen = basedir_len(path_items.match);
 201         read_tree(the_repository, repo_get_commit_tree(the_repository, commit),
 202                   &paths, walk_tree, &walk_tree_ctx);
 203         if (!walk_tree_ctx.match)
 204                 cgit_print_error_page(404, "Not found", "Not found");
 205         else if (walk_tree_ctx.match == 2)
 206                 print_dir_tail();
 207 }