Support urlencoded http authentication credentials

It should be possible to specify usernames in http requests containing
urlencoded characters. This patch adds support for decoding the auth
strings.
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/Makefile

@@ -277,9 +277,10 @@ OBJS-$(CONFIG_RTPDEC)                    += rdt.o         \
                                             rtpdec_svq3.o \
                                             rtpdec_vp8.o  \
                                             rtpdec_xiph.o
-OBJS-$(CONFIG_RTSP_DEMUXER)              += rtsp.o rtspdec.o httpauth.o
+OBJS-$(CONFIG_RTSP_DEMUXER)              += rtsp.o rtspdec.o httpauth.o \
+                                            urldecode.o
 OBJS-$(CONFIG_RTSP_MUXER)                += rtsp.o rtspenc.o httpauth.o \
-                                            rtpenc_chain.o
+                                            rtpenc_chain.o urldecode.o
 OBJS-$(CONFIG_SAP_DEMUXER)               += sapdec.o
 OBJS-$(CONFIG_SAP_MUXER)                 += sapenc.o rtpenc_chain.o
 OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o
@@ -346,9 +347,9 @@ OBJS-$(CONFIG_FFRTMPHTTP_PROTOCOL)       += rtmphttp.o
 OBJS-$(CONFIG_FILE_PROTOCOL)             += file.o
 OBJS-$(CONFIG_GOPHER_PROTOCOL)           += gopher.o
 OBJS-$(CONFIG_HLS_PROTOCOL)              += hlsproto.o
-OBJS-$(CONFIG_HTTP_PROTOCOL)             += http.o httpauth.o
-OBJS-$(CONFIG_HTTPPROXY_PROTOCOL)        += http.o httpauth.o
-OBJS-$(CONFIG_HTTPS_PROTOCOL)            += http.o httpauth.o
+OBJS-$(CONFIG_HTTP_PROTOCOL)             += http.o httpauth.o urldecode.o
+OBJS-$(CONFIG_HTTPPROXY_PROTOCOL)        += http.o httpauth.o urldecode.o
+OBJS-$(CONFIG_HTTPS_PROTOCOL)            += http.o httpauth.o urldecode.o
 OBJS-$(CONFIG_MMSH_PROTOCOL)             += mmsh.o mms.o asf.o
 OBJS-$(CONFIG_MMST_PROTOCOL)             += mmst.o mms.o asf.o
 OBJS-$(CONFIG_MD5_PROTOCOL)              += md5proto.o

libavformat/httpauth.c

@@ -25,6 +25,7 @@
 #include "internal.h"
 #include "libavutil/random_seed.h"
 #include "libavutil/md5.h"
+#include "urldecode.h"
 #include "avformat.h"
 #include <ctype.h>
 
@@ -251,18 +252,28 @@ char *ff_http_auth_create_response(HTTPAuthState *state, const char *auth,
         return NULL;
 
     if (state->auth_type == HTTP_AUTH_BASIC) {
-        int auth_b64_len = AV_BASE64_SIZE(strlen(auth));
-        int len = auth_b64_len + 30;
-        char *ptr;
+        int auth_b64_len, len;
+        char *ptr, *decoded_auth = ff_urldecode(auth);
+
+        if (!decoded_auth)
+            return NULL;
+
+        auth_b64_len = AV_BASE64_SIZE(strlen(decoded_auth));
+        len = auth_b64_len + 30;
+
         authstr = av_malloc(len);
-        if (!authstr)
+        if (!authstr) {
+            av_free(decoded_auth);
             return NULL;
+        }
+
         snprintf(authstr, len, "Authorization: Basic ");
         ptr = authstr + strlen(authstr);
-        av_base64_encode(ptr, auth_b64_len, auth, strlen(auth));
+        av_base64_encode(ptr, auth_b64_len, decoded_auth, strlen(decoded_auth));
         av_strlcat(ptr, "\r\n", len - (ptr - authstr));
+        av_free(decoded_auth);
     } else if (state->auth_type == HTTP_AUTH_DIGEST) {
-        char *username = av_strdup(auth), *password;
+        char *username = ff_urldecode(auth), *password;
 
         if (!username)
             return NULL;

libavformat/urldecode.c

+/*
+ * Simple URL decoding function
+ * Copyright (c) 2012 Antti Seppälä
+ *
+ * References:
+ *  RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+ *       T. Berners-Lee et al. The Internet Society, 2005
+ *
+ * based on http://www.icosaedro.it/apache/urldecode.c
+ *          from Umberto Salsi (salsi@icosaedro.it)
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <ctype.h>
+#include <string.h>
+
+#include "libavutil/mem.h"
+#include "libavutil/avstring.h"
+#include "urldecode.h"
+
+char *ff_urldecode(const char *url)
+{
+    int s = 0, d = 0, url_len = 0;
+    char c;
+    char *dest = NULL;
+
+    if (!url)
+        return NULL;
+
+    url_len = strlen(url) + 1;
+    dest = av_malloc(url_len);
+
+    if (!dest)
+        return NULL;
+
+    while (s < url_len) {
+        c = url[s++];
+
+        if (c == '%' && s + 2 < url_len) {
+            char c2 = url[s++];
+            char c3 = url[s++];
+            if (isxdigit(c2) && isxdigit(c3)) {
+                c2 = av_tolower(c2);
+                c3 = av_tolower(c3);
+
+                if (c2 <= '9')
+                    c2 = c2 - '0';
+                else
+                    c2 = c2 - 'a' + 10;
+
+                if (c3 <= '9')
+                    c3 = c3 - '0';
+                else
+                    c3 = c3 - 'a' + 10;
+
+                dest[d++] = 16 * c2 + c3;
+
+            } else { /* %zz or something other invalid */
+                dest[d++] = c;
+                dest[d++] = c2;
+                dest[d++] = c3;
+            }
+        } else if (c == '+') {
+            dest[d++] = ' ';
+        } else {
+            dest[d++] = c;
+        }
+
+    }
+
+    return dest;
+}

libavformat/urldecode.h

+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_URLDECODE_H
+#define AVFORMAT_URLDECODE_H
+
+/**
+ * Decodes an URL from its percent-encoded form back into normal
+ * representation. This function returns the decoded URL in a string.
+ * The URL to be decoded does not necessarily have to be encoded but
+ * in that case the original string is duplicated.
+ *
+ * @param url a string to be decoded.
+ * @return new string with the URL decoded or NULL if decoding failed.
+ * Note that the returned string should be explicitly freed when not
+ * used anymore.
+ */
+char *ff_urldecode(const char *url);
+
+#endif /* AVFORMAT_URLDECODE_H */

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR 54
 #define LIBAVFORMAT_VERSION_MINOR 12
-#define LIBAVFORMAT_VERSION_MICRO  0
+#define LIBAVFORMAT_VERSION_MICRO  1
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \