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[87.211.253.60]) by smtp.gmail.com with ESMTPSA id l19sm5431885ejq.139.2022.01.31.05.52.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Jan 2022 05:52:37 -0800 (PST) From: Mark Gaiser To: ffmpeg-devel@ffmpeg.org Date: Mon, 31 Jan 2022 14:51:12 +0100 Message-Id: <20220131135116.14035-2-markg85@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220131135116.14035-1-markg85@gmail.com> References: <20220131135116.14035-1-markg85@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 1/5] Early version of IPFS protocol support. X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Mark Gaiser Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Signed-off-by: Mark Gaiser --- configure | 1 + doc/protocols.texi | 30 ++++++ libavformat/Makefile | 1 + libavformat/ipfs.c | 202 ++++++++++++++++++++++++++++++++++++++++ libavformat/protocols.c | 2 + 5 files changed, 236 insertions(+) create mode 100644 libavformat/ipfs.c diff --git a/configure b/configure index 5b19a35f59..e466f924a3 100755 --- a/configure +++ b/configure @@ -3585,6 +3585,7 @@ udp_protocol_select="network" udplite_protocol_select="network" unix_protocol_deps="sys_un_h" unix_protocol_select="network" +ipfs_protocol_select="https_protocol" # external library protocols libamqp_protocol_deps="librabbitmq" diff --git a/doc/protocols.texi b/doc/protocols.texi index d207df0b52..7c9c0a4808 100644 --- a/doc/protocols.texi +++ b/doc/protocols.texi @@ -2025,5 +2025,35 @@ decoding errors. @end table +@section ipfs + +InterPlanetary File System (IPFS) protocol support. One can access files stored +on the IPFS network through so called gateways. Those are http(s) endpoints. +This protocol wraps the IPFS native protocols (ipfs:// and ipns://) to be send +to such a gateway. Users can (and should) host their own node which means this +protocol will use your local machine gateway to access files on the IPFS network. + +If a user doesn't have a node of their own then the public gateway dweb.link is +used by default. + +You can use this protocol in 2 ways. Using IPFS: +@example +ffplay ipfs://QmbGtJg23skhvFmu9mJiePVByhfzu5rwo74MEkVDYAmF5T +@end example + +Or the IPNS protocol (IPNS is mutable IPFS): +@example +ffplay ipns://QmbGtJg23skhvFmu9mJiePVByhfzu5rwo74MEkVDYAmF5T +@end example + +You can also change the gateway to be used: + +@table @option + +@item gateway +Defines the gateway to use. When nothing is provided the protocol will first try +your local gateway. If that fails dweb.link will be used. + +@end table @c man end PROTOCOLS diff --git a/libavformat/Makefile b/libavformat/Makefile index 3dc6a479cc..983a77f4f2 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -656,6 +656,7 @@ OBJS-$(CONFIG_SRTP_PROTOCOL) += srtpproto.o srtp.o OBJS-$(CONFIG_SUBFILE_PROTOCOL) += subfile.o OBJS-$(CONFIG_TEE_PROTOCOL) += teeproto.o tee_common.o OBJS-$(CONFIG_TCP_PROTOCOL) += tcp.o +OBJS-$(CONFIG_IPFS_PROTOCOL) += ipfs.o TLS-OBJS-$(CONFIG_GNUTLS) += tls_gnutls.o TLS-OBJS-$(CONFIG_LIBTLS) += tls_libtls.o TLS-OBJS-$(CONFIG_MBEDTLS) += tls_mbedtls.o diff --git a/libavformat/ipfs.c b/libavformat/ipfs.c new file mode 100644 index 0000000000..4cc65750ed --- /dev/null +++ b/libavformat/ipfs.c @@ -0,0 +1,202 @@ +/* + * IPFS protocol. + * Copyright (c) 2021 Mark Gaiser + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/avassert.h" +#include "libavutil/avstring.h" +#include "libavutil/internal.h" +#include "libavutil/opt.h" +#include "libavutil/tree.h" +#include "avformat.h" +#include +#if HAVE_IO_H +#include +#endif +#if HAVE_UNISTD_H +#include +#endif +#include +#include +#include "os_support.h" +#include "url.h" + +typedef struct Context { + AVClass *class; + URLContext *inner; + char *fulluri; + char *gateway; +} Context; + +static int ipfs_open(URLContext *h, const char *uri, int flags, AVDictionary **options) +{ + const char *gatewaysuffix; + int ret = 0; + Context *c = h->priv_data; + + if (!av_strstart(uri, "ipfs://", &gatewaysuffix) && + !av_strstart(uri, "ipfs:", &gatewaysuffix)) { + av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri); + ret = AVERROR(EINVAL); + goto err; + } + + char* ipfs_gateway = "https://ipfs.io/ipfs/"; + + c->fulluri = malloc(strlen(ipfs_gateway)+strlen(gatewaysuffix) + 1); + + strcpy(c->fulluri, ipfs_gateway); + strcat(c->fulluri, gatewaysuffix); + + if ((ret = ffurl_open_whitelist(&c->inner, c->fulluri, flags, + &h->interrupt_callback, options, + h->protocol_whitelist, h->protocol_blacklist, h)) < 0) { + av_log(h, AV_LOG_ERROR, "Unable to open resource: %s\n", c->fulluri); + goto err; + } + +err: + return ret; +} + +static int ipfs_read(URLContext *h, unsigned char *buf, int size) +{ + Context *c = h->priv_data; + int ret; + + ret = ffurl_read(c->inner, buf, size); + + return ret; +} + +static int64_t ipfs_seek(URLContext *h, int64_t pos, int whence) +{ + Context *c = h->priv_data; + int64_t ret; + + ret = ffurl_seek(c->inner, pos, whence); + + return ret; +} + +static int ipfs_close(URLContext *h) +{ + Context *c = h->priv_data; + int ret; + + ret = ffurl_closep(&c->inner); + + return ret; +} + +static int ipns_open(URLContext *h, const char *uri, int flags, AVDictionary **options) +{ + const char *gatewaysuffix; + int ret = 0; + Context *c = h->priv_data; + + if (!av_strstart(uri, "ipns://", &gatewaysuffix) && + !av_strstart(uri, "ipns:", &gatewaysuffix)) { + av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri); + ret = AVERROR(EINVAL); + goto err; + } + + char* ipfs_gateway = "https://ipfs.io/ipns/"; + + c->fulluri = malloc(strlen(ipfs_gateway)+strlen(gatewaysuffix) + 1); + + strcpy(c->fulluri, ipfs_gateway); + strcat(c->fulluri, gatewaysuffix); + + if ((ret = ffurl_open_whitelist(&c->inner, c->fulluri, flags, + &h->interrupt_callback, options, + h->protocol_whitelist, h->protocol_blacklist, h)) < 0) { + av_log(h, AV_LOG_ERROR, "Unable to open resource: %s\n", c->fulluri); + goto err; + } + +err: + return ret; +} + +static int ipns_read(URLContext *h, unsigned char *buf, int size) +{ + Context *c = h->priv_data; + int ret; + + ret = ffurl_read(c->inner, buf, size); + + return ret; +} + +static int64_t ipns_seek(URLContext *h, int64_t pos, int whence) +{ + Context *c = h->priv_data; + int64_t ret; + + ret = ffurl_seek(c->inner, pos, whence); + + return ret; +} + +static int ipns_close(URLContext *h) +{ + Context *c = h->priv_data; + int ret; + + ret = ffurl_closep(&c->inner); + + return ret; +} + +#define OFFSET(x) offsetof(Context, x) +#define D AV_OPT_FLAG_DECODING_PARAM + +static const AVOption options[] = { + {"gateway", "The gateway to ask for IPFS data.", OFFSET(gateway), AV_OPT_TYPE_BINARY, .flags = D }, + {NULL}, +}; + +static const AVClass ipfs_context_class = { + .class_name = "IPFS", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +const URLProtocol ff_ipfs_protocol = { + .name = "ipfs", + .url_open2 = ipfs_open, + .url_read = ipfs_read, + .url_seek = ipfs_seek, + .url_close = ipfs_close, + .priv_data_size = sizeof(Context), + .priv_data_class = &ipfs_context_class, +}; + +const URLProtocol ff_infs_protocol = { + .name = "ipns", + .url_open2 = ipfs_open, + .url_read = ipfs_read, + .url_seek = ipfs_seek, + .url_close = ipfs_close, + .priv_data_size = sizeof(Context), + .priv_data_class = &ipfs_context_class, +}; diff --git a/libavformat/protocols.c b/libavformat/protocols.c index 948fae411f..675b684bd3 100644 --- a/libavformat/protocols.c +++ b/libavformat/protocols.c @@ -73,6 +73,8 @@ extern const URLProtocol ff_libsrt_protocol; extern const URLProtocol ff_libssh_protocol; extern const URLProtocol ff_libsmbclient_protocol; extern const URLProtocol ff_libzmq_protocol; +extern const URLProtocol ff_ipfs_protocol; +extern const URLProtocol ff_ipns_protocol; #include "libavformat/protocol_list.c" -- 2.35.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".