"max-blob-size" config var to limit generated HTML size

Sometimes it is not feasible to generate the HTML pretty-print for large
files, especially if a source-filter is involved or binary data is to be
displayed. The "max-blob-size" config var allows to disable HTML output
for blobs bigger than X KBytes. Plain downloads are not affected.

Signed-off-by: Georg Lukas <georg@op-co.de>

4 files changed, 14 insertions, 0 deletions

diff --git a/cgit.c b/cgit.c
index a17f40d..e1d38c2 100644
--- a/cgit.c
+++ b/cgit.c
@@ -165,6 +165,8 @@ void config_cb(const char *name, const char *value)
                 ctx.cfg.max_msg_len = atoi(value);
         else if (!strcmp(name, "max-repodesc-length"))
                 ctx.cfg.max_repodesc_len = atoi(value);
+        else if (!strcmp(name, "max-blob-size"))
+                ctx.cfg.max_blob_size = atoi(value);
         else if (!strcmp(name, "max-repo-count"))
                 ctx.cfg.max_repo_count = atoi(value);
         else if (!strcmp(name, "max-commit-count"))
@@ -270,6 +272,7 @@ static void prepare_context(struct cgit_context *ctx)
         ctx->cfg.max_lock_attempts = 5;
         ctx->cfg.max_msg_len = 80;
         ctx->cfg.max_repodesc_len = 80;
+        ctx->cfg.max_blob_size = 0;
         ctx->cfg.max_stats = 0;
         ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
         ctx->cfg.renamelimit = -1;
diff --git a/cgit.h b/cgit.h
index 6c6c460..39853df 100644
--- a/cgit.h
+++ b/cgit.h
@@ -185,6 +185,7 @@ struct cgit_config {
         int max_lock_attempts;
         int max_msg_len;
         int max_repodesc_len;
+        int max_blob_size;
         int max_stats;
         int nocache;
         int noplainemail;
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 0c13485..e69140b 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -177,6 +177,10 @@ max-repodesc-length::
         Specifies the maximum number of repo description characters to display
         on the repository index page. Default value: "80".
 
+max-blob-size::
+        Specifies the maximum size of a blob to display HTML for in KBytes.
+        Default value: "0" (limit disabled).
+
 max-stats::
         Set the default maximum statistics period. Valid values are "week",
         "month", "quarter" and "year". If unspecified, statistics are
diff --git a/ui-tree.c b/ui-tree.c
index f53ab64..f281937 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -107,6 +107,12 @@ static void print_object(const unsigned char *sha1, char *path, const char *base
                         curr_rev, path);
         htmlf(")<br/>blob: %s\n", sha1_to_hex(sha1));
 
+        if (ctx.cfg.max_blob_size && size / 1024 > ctx.cfg.max_blob_size) {
+                htmlf("<div class='error'>blob size (%dKB) exceeds display size limit (%dKB).</div>",
+                                size / 1024, ctx.cfg.max_blob_size);
+                return;
+        }
+
         if (buffer_is_binary(buf, size))
                 print_binary_buffer(buf, size);
         else