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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* soup-content-decoder.c
*
* Copyright (C) 2009 Red Hat, Inc.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "soup-content-decoder.h"
#include "soup-converter-wrapper.h"
#include "soup.h"
#include "soup-message-private.h"
/**
* SECTION:soup-content-decoder
* @short_description: Content-Encoding handler
*
* #SoupContentDecoder handles the "Accept-Encoding" header on
* outgoing messages, and the "Content-Encoding" header on incoming
* ones. If you add it to a session with soup_session_add_feature() or
* soup_session_add_feature_by_type(), the session will automatically
* use Content-Encoding as appropriate.
*
* (Note that currently there is no way to (automatically) use
* Content-Encoding when sending a request body, or to pick specific
* encoding types to support.)
*
* If #SoupContentDecoder successfully decodes the Content-Encoding,
* it will set the %SOUP_MESSAGE_CONTENT_DECODED flag on the message,
* and the message body and the chunks in the #SoupMessage::got_chunk
* signals will contain the decoded data; however, the message headers
* will be unchanged (and so "Content-Encoding" will still be present,
* "Content-Length" will describe the original encoded length, etc).
*
* If "Content-Encoding" contains any encoding types that
* #SoupContentDecoder doesn't recognize, then none of the encodings
* will be decoded (and the %SOUP_MESSAGE_CONTENT_DECODED flag will
* not be set).
*
* Since: 2.28.2
**/
struct _SoupContentDecoderPrivate {
GHashTable *decoders;
};
typedef GConverter * (*SoupContentDecoderCreator) (void);
static void soup_content_decoder_session_feature_init (SoupSessionFeatureInterface *feature_interface, gpointer interface_data);
static SoupContentProcessorInterface *soup_content_decoder_default_content_processor_interface;
static void soup_content_decoder_content_processor_init (SoupContentProcessorInterface *interface, gpointer interface_data);
G_DEFINE_TYPE_WITH_CODE (SoupContentDecoder, soup_content_decoder, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (SOUP_TYPE_SESSION_FEATURE,
soup_content_decoder_session_feature_init)
G_IMPLEMENT_INTERFACE (SOUP_TYPE_CONTENT_PROCESSOR,
soup_content_decoder_content_processor_init))
static GSList *
soup_content_decoder_get_decoders_for_msg (SoupContentDecoder *decoder, SoupMessage *msg)
{
const char *header;
GSList *encodings, *e, *decoders = NULL;
SoupContentDecoderCreator converter_creator;
GConverter *converter;
header = soup_message_headers_get_list (msg->response_headers,
"Content-Encoding");
if (!header)
return NULL;
/* Workaround for an apache bug (bgo 613361) */
if (!g_ascii_strcasecmp (header, "gzip") ||
!g_ascii_strcasecmp (header, "x-gzip")) {
const char *content_type = soup_message_headers_get_content_type (msg->response_headers, NULL);
if (content_type &&
(!g_ascii_strcasecmp (content_type, "application/gzip") ||
!g_ascii_strcasecmp (content_type, "application/x-gzip")))
return NULL;
}
/* OK, really, no one is ever going to use more than one
* encoding, but we'll be robust.
*/
encodings = soup_header_parse_list (header);
if (!encodings)
return NULL;
for (e = encodings; e; e = e->next) {
if (!g_hash_table_lookup (decoder->priv->decoders, e->data)) {
soup_header_free_list (encodings);
return NULL;
}
}
for (e = encodings; e; e = e->next) {
converter_creator = g_hash_table_lookup (decoder->priv->decoders, e->data);
converter = converter_creator ();
/* Content-Encoding lists the codings in the order
* they were applied in, so we put decoders in reverse
* order so the last-applied will be the first
* decoded.
*/
decoders = g_slist_prepend (decoders, converter);
}
soup_header_free_list (encodings);
return decoders;
}
static GInputStream*
soup_content_decoder_content_processor_wrap_input (SoupContentProcessor *processor,
GInputStream *base_stream,
SoupMessage *msg,
GError **error)
{
GSList *decoders, *d;
GInputStream *istream;
decoders = soup_content_decoder_get_decoders_for_msg (SOUP_CONTENT_DECODER (processor), msg);
if (!decoders)
return NULL;
istream = g_object_ref (base_stream);
for (d = decoders; d; d = d->next) {
GConverter *decoder, *wrapper;
GInputStream *filter;
decoder = d->data;
wrapper = soup_converter_wrapper_new (decoder, msg);
filter = g_object_new (G_TYPE_CONVERTER_INPUT_STREAM,
"base-stream", istream,
"converter", wrapper,
NULL);
g_object_unref (istream);
g_object_unref (wrapper);
istream = filter;
}
g_slist_free_full (decoders, g_object_unref);
return istream;
}
static void
soup_content_decoder_content_processor_init (SoupContentProcessorInterface *processor_interface,
gpointer interface_data)
{
soup_content_decoder_default_content_processor_interface =
g_type_default_interface_peek (SOUP_TYPE_CONTENT_PROCESSOR);
processor_interface->processing_stage = SOUP_STAGE_CONTENT_ENCODING;
processor_interface->wrap_input = soup_content_decoder_content_processor_wrap_input;
}
/* This is constant for now */
#define ACCEPT_ENCODING_HEADER "gzip, deflate"
static GConverter *
gzip_decoder_creator (void)
{
return (GConverter *)g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
}
static GConverter *
zlib_decoder_creator (void)
{
return (GConverter *)g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_ZLIB);
}
static void
soup_content_decoder_init (SoupContentDecoder *decoder)
{
decoder->priv = G_TYPE_INSTANCE_GET_PRIVATE (decoder,
SOUP_TYPE_CONTENT_DECODER,
SoupContentDecoderPrivate);
decoder->priv->decoders = g_hash_table_new (g_str_hash, g_str_equal);
/* Hardcoded for now */
g_hash_table_insert (decoder->priv->decoders, "gzip",
gzip_decoder_creator);
g_hash_table_insert (decoder->priv->decoders, "x-gzip",
gzip_decoder_creator);
g_hash_table_insert (decoder->priv->decoders, "deflate",
zlib_decoder_creator);
}
static void
soup_content_decoder_finalize (GObject *object)
{
SoupContentDecoder *decoder = SOUP_CONTENT_DECODER (object);
g_hash_table_destroy (decoder->priv->decoders);
G_OBJECT_CLASS (soup_content_decoder_parent_class)->finalize (object);
}
static void
soup_content_decoder_class_init (SoupContentDecoderClass *decoder_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (decoder_class);
g_type_class_add_private (decoder_class, sizeof (SoupContentDecoderPrivate));
object_class->finalize = soup_content_decoder_finalize;
}
static void
soup_content_decoder_request_queued (SoupSessionFeature *feature,
SoupSession *session,
SoupMessage *msg)
{
if (!soup_message_headers_get_one (msg->request_headers,
"Accept-Encoding")) {
soup_message_headers_append (msg->request_headers,
"Accept-Encoding",
ACCEPT_ENCODING_HEADER);
}
}
static void
soup_content_decoder_session_feature_init (SoupSessionFeatureInterface *feature_interface,
gpointer interface_data)
{
feature_interface->request_queued = soup_content_decoder_request_queued;
}
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