ui-blob.c

   1 /* ui-blob.c: show blob content
   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-blob.h"
  11 #include "html.h"
  12 #include "ui-shared.h"
  13
  14 struct walk_tree_context {
  15         const char *match_path;
  16         struct object_id *matched_oid;
  17         unsigned int found_path:1;
  18         unsigned int file_only:1;
  19 };
  20
  21 static int walk_tree(const unsigned char *sha1, struct strbuf *base,
  22                 const char *pathname, unsigned mode, int stage, void *cbdata)
  23 {
  24         struct walk_tree_context *walk_tree_ctx = cbdata;
  25
  26         if (walk_tree_ctx->file_only && !S_ISREG(mode))
  27                 return READ_TREE_RECURSIVE;
  28         if (strncmp(base->buf, walk_tree_ctx->match_path, base->len)
  29                 || strcmp(walk_tree_ctx->match_path + base->len, pathname))
  30                 return READ_TREE_RECURSIVE;
  31         hashcpy(walk_tree_ctx->matched_oid->hash, sha1);
  32         walk_tree_ctx->found_path = 1;
  33         return 0;
  34 }
  35
  36 int cgit_ref_path_exists(const char *path, const char *ref, int file_only)
  37 {
  38         struct object_id oid;
  39         unsigned long size;
  40         struct pathspec_item path_items = {
  41                 .match = xstrdup(path),
  42                 .len = strlen(path)
  43         };
  44         struct pathspec paths = {
  45                 .nr = 1,
  46                 .items = &path_items
  47         };
  48         struct walk_tree_context walk_tree_ctx = {
  49                 .match_path = path,
  50                 .matched_oid = &oid,
  51                 .found_path = 0,
  52                 .file_only = file_only
  53         };
  54
  55         if (get_oid(ref, &oid))
  56                 goto done;
  57         if (sha1_object_info(oid.hash, &size) != OBJ_COMMIT)
  58                 goto done;
  59         read_tree_recursive(lookup_commit_reference(&oid)->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
  60
  61 done:
  62         free(path_items.match);
  63         return walk_tree_ctx.found_path;
  64 }
  65
  66 int cgit_print_file(char *path, const char *head, int file_only)
  67 {
  68         struct object_id oid;
  69         enum object_type type;
  70         char *buf;
  71         unsigned long size;
  72         struct commit *commit;
  73         struct pathspec_item path_items = {
  74                 .match = path,
  75                 .len = strlen(path)
  76         };
  77         struct pathspec paths = {
  78                 .nr = 1,
  79                 .items = &path_items
  80         };
  81         struct walk_tree_context walk_tree_ctx = {
  82                 .match_path = path,
  83                 .matched_oid = &oid,
  84                 .found_path = 0,
  85                 .file_only = file_only
  86         };
  87
  88         if (get_oid(head, &oid))
  89                 return -1;
  90         type = sha1_object_info(oid.hash, &size);
  91         if (type == OBJ_COMMIT) {
  92                 commit = lookup_commit_reference(&oid);
  93                 read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
  94                 if (!walk_tree_ctx.found_path)
  95                         return -1;
  96                 type = sha1_object_info(oid.hash, &size);
  97         }
  98         if (type == OBJ_BAD)
  99                 return -1;
 100         buf = read_sha1_file(oid.hash, &type, &size);
 101         if (!buf)
 102                 return -1;
 103         buf[size] = '\0';
 104         html_raw(buf, size);
 105         free(buf);
 106         return 0;
 107 }
 108
 109 void cgit_print_blob(const char *hex, char *path, const char *head, int file_only)
 110 {
 111         struct object_id oid;
 112         enum object_type type;
 113         char *buf;
 114         unsigned long size;
 115         struct commit *commit;
 116         struct pathspec_item path_items = {
 117                 .match = path,
 118                 .len = path ? strlen(path) : 0
 119         };
 120         struct pathspec paths = {
 121                 .nr = 1,
 122                 .items = &path_items
 123         };
 124         struct walk_tree_context walk_tree_ctx = {
 125                 .match_path = path,
 126                 .matched_oid = &oid,
 127                 .found_path = 0,
 128                 .file_only = file_only
 129         };
 130
 131         if (hex) {
 132                 if (get_oid_hex(hex, &oid)) {
 133                         cgit_print_error_page(400, "Bad request",
 134                                         "Bad hex value: %s", hex);
 135                         return;
 136                 }
 137         } else {
 138                 if (get_oid(head, &oid)) {
 139                         cgit_print_error_page(404, "Not found",
 140                                         "Bad ref: %s", head);
 141                         return;
 142                 }
 143         }
 144
 145         type = sha1_object_info(oid.hash, &size);
 146
 147         if ((!hex) && type == OBJ_COMMIT && path) {
 148                 commit = lookup_commit_reference(&oid);
 149                 read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 150                 type = sha1_object_info(oid.hash, &size);
 151         }
 152
 153         if (type == OBJ_BAD) {
 154                 cgit_print_error_page(404, "Not found",
 155                                 "Bad object name: %s", hex);
 156                 return;
 157         }
 158
 159         buf = read_sha1_file(oid.hash, &type, &size);
 160         if (!buf) {
 161                 cgit_print_error_page(500, "Internal server error",
 162                                 "Error reading object %s", hex);
 163                 return;
 164         }
 165
 166         buf[size] = '\0';
 167         if (buffer_is_binary(buf, size))
 168                 ctx.page.mimetype = "application/octet-stream";
 169         else
 170                 ctx.page.mimetype = "text/plain";
 171         ctx.page.filename = path;
 172
 173         html("X-Content-Type-Options: nosniff\n");
 174         html("Content-Security-Policy: default-src 'none'\n");
 175         cgit_print_http_headers();
 176         html_raw(buf, size);
 177         free(buf);
 178 }