Changeset c3353ae5 in rtems

Timestamp:

03/08/18 04:12:30 (5 years ago)

Author:

Chris Johns <chrisj@…>

Branches:

4.11

Children:

d4165e71

Parents:

7093cb5e

git-author:

Chris Johns <chrisj@…> (03/08/18 04:12:30)

git-committer:

Chris Johns <chrisj@…> (03/08/18 04:34:15)

Message:

cpukit/mttpd: Add a callback to generate a per file HTTP etag.

Closes #3324

Location:

cpukit/mghttpd

Files:

• mongoose.c (modified) (4 diffs)
• mongoose.h (modified) (1 diff)

cpukit/mghttpd/mongoose.c

@@ -2990 +2990 @@
 }
 
-static void construct_etag(char *buf, size_t buf_len,
+static void construct_etag(const struct mg_connection *conn, const char *path,
+                           char *buf, size_t buf_len,
                            const struct file *filep) {
-  snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
-           (unsigned long) filep->modification_time, filep->size);
+  if (conn->ctx->callbacks.http_etag != NULL &&
+      conn->ctx->callbacks.http_etag(conn, path, buf, buf_len)) {
+  }
+  else {
+    snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"",
+             (unsigned long) filep->modification_time, filep->size);
+  }
 }
 
@@ -3062 +3068 @@
   gmt_time_string(date, sizeof(date), &curtime);
   gmt_time_string(lm, sizeof(lm), &filep->modification_time);
-  construct_etag(etag, sizeof(etag), filep);
+  construct_etag(conn, path, etag, sizeof(etag), filep);
 
   (void) mg_printf(conn,
@@ -3222 +3228 @@
 // Return True if we should reply 304 Not Modified.
 static int is_not_modified(const struct mg_connection *conn,
+                           const char *path,
                            const struct file *filep) {
   char etag[64];
   const char *ims = mg_get_header(conn, "If-Modified-Since");
   const char *inm = mg_get_header(conn, "If-None-Match");
-  construct_etag(etag, sizeof(etag), filep);
+  construct_etag(conn, path, etag, sizeof(etag), filep);
   return (inm != NULL && !mg_strcasecmp(etag, inm)) ||
     (ims != NULL && filep->modification_time <= parse_date_string(ims));
@@ -4592 +4599 @@
                           path) > 0) {
     handle_ssi_file_request(conn, path);
-  } else if (is_not_modified(conn, &file)) {
+  } else if (is_not_modified(conn, path, &file)) {
     send_http_error(conn, 304, "Not Modified", "%s", "");
   } else {

cpukit/mghttpd/mongoose.h

@@ -125 +125 @@
   //   status: HTTP error status code.
   int  (*http_error)(struct mg_connection *, int status);
+
+  // Called when mongoose needs to generate an HTTP etag.
+  // Implementing this callback allows a custom etag to be generated. If
+  // not implemented the standard etag generator is used which is the
+  // modification time as a hex value and the file size.
+  // Use this callback if the modification time cannot be controlled.
+  // Parameters:
+  //   path: path to the file being requested
+  //   etag: buffer to write the etag into
+  //   etag_len: the length of the etag buffer
+  // Return value:
+  int  (*http_etag)(const struct mg_connection *,
+                    const char *path, char *etag, size_t etag_len);
 };