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[87.211.253.60]) by smtp.gmail.com with ESMTPSA id g2sm14007902edt.44.2022.02.13.10.19.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Feb 2022 10:19:55 -0800 (PST) From: Mark Gaiser To: ffmpeg-devel@ffmpeg.org Date: Sun, 13 Feb 2022 19:18:26 +0100 Message-Id: <20220213181826.251039-2-markg85@gmail.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220213181826.251039-1-markg85@gmail.com> References: <20220213181826.251039-1-markg85@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v6 1/1] avformat: Add 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 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: hzxQJ2WfQHE5 This patch adds support for: - ffplay ipfs:// - ffplay ipns:// IPFS data can be played from so called "ipfs gateways". A gateway is essentially a webserver that gives access to the distributed IPFS network. This protocol support (ipfs and ipns) therefore translates ipfs:// and ipns:// to a http:// url. This resulting url is then handled by the http protocol. It could also be https depending on the gateway provided. To use this protocol, a gateway must be provided. If you do nothing it will try to find it in your $HOME/.ipfs/gateway file. The ways to set it manually are: 1. Define a -gateway to the gateway. 2. Define $IPFS_GATEWAY with the full http link to the gateway. 3. Define $IPFS_PATH and point it to the IPFS data path. 4. Have IPFS running in your local user folder (under $HOME/.ipfs). Signed-off-by: Mark Gaiser --- configure | 2 + doc/protocols.texi | 30 ++++ libavformat/Makefile | 2 + libavformat/ipfsgateway.c | 324 ++++++++++++++++++++++++++++++++++++++ libavformat/protocols.c | 2 + 5 files changed, 360 insertions(+) create mode 100644 libavformat/ipfsgateway.c diff --git a/configure b/configure index 5b19a35f59..6ff09e7974 100755 --- a/configure +++ b/configure @@ -3585,6 +3585,8 @@ udp_protocol_select="network" udplite_protocol_select="network" unix_protocol_deps="sys_un_h" unix_protocol_select="network" +ipfs_protocol_select="https_protocol" +ipns_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..4edce8420f 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -656,6 +656,8 @@ 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) += ipfsgateway.o +OBJS-$(CONFIG_IPNS_PROTOCOL) += ipfsgateway.o TLS-OBJS-$(CONFIG_GNUTLS) += tls_gnutls.o TLS-OBJS-$(CONFIG_LIBTLS) += tls_libtls.o TLS-OBJS-$(CONFIG_MBEDTLS) += tls_mbedtls.o diff --git a/libavformat/ipfsgateway.c b/libavformat/ipfsgateway.c new file mode 100644 index 0000000000..dcafd375e8 --- /dev/null +++ b/libavformat/ipfsgateway.c @@ -0,0 +1,324 @@ +/* + * IPFS and IPNS protocol support through IPFS Gateway. + * Copyright (c) 2022 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 "avformat.h" +#include "libavutil/avassert.h" +#include "libavutil/avstring.h" +#include "libavutil/internal.h" +#include "libavutil/opt.h" +#include "libavutil/tree.h" +#include +#if HAVE_IO_H +#include +#endif +#if HAVE_UNISTD_H +#include +#endif +#include "os_support.h" +#include "url.h" +#include +#include + +typedef struct IPFSGatewayContext { + AVClass *class; + URLContext *inner; + // Is filled by the -gateway argument and not changed after. + char *gateway; + // If the above gateway is non null, it will be copied into this buffer. + // Else this buffer will contain the auto detected gateway. + // In either case, the gateway to use will be in this buffer. + char gateway_buffer[PATH_MAX]; +} IPFSGatewayContext; + +// A best-effort way to find the IPFS gateway. +// Only the most appropiate gateway is set. It's not actually requested +// (http call) to prevent a potential slowdown in startup. A potential timeout +// is handled by the HTTP protocol. +static int populate_ipfs_gateway(URLContext *h) +{ + IPFSGatewayContext *c = h->priv_data; + char ipfs_full_data_folder[PATH_MAX]; + char ipfs_gateway_file[PATH_MAX]; + struct stat st; + int stat_ret = 0; + int ret = AVERROR(EINVAL); + FILE *gateway_file = NULL; + char gateway_file_data[PATH_MAX]; + + // Test $IPFS_GATEWAY. + if (getenv("IPFS_GATEWAY") != NULL) { + snprintf(c->gateway_buffer, sizeof(c->gateway_buffer), "%s", + getenv("IPFS_GATEWAY")); + ret = 1; + goto err; + } else + av_log(h, AV_LOG_DEBUG, "$IPFS_GATEWAY is empty.\n"); + + // We need to know the IPFS folder to - eventually - read the contents of + // the "gateway" file which would tell us the gateway to use. + if (getenv("IPFS_PATH") == NULL) { + av_log(h, AV_LOG_DEBUG, "$IPFS_PATH is empty.\n"); + + // Try via the home folder. + if (getenv("HOME") == NULL) { + av_log(h, AV_LOG_ERROR, "$HOME appears to be empty.\n"); + ret = AVERROR(EINVAL); + goto err; + } + + // Verify the composed path fits. + if (snprintf(ipfs_full_data_folder, sizeof(ipfs_full_data_folder), + "%s/.ipfs/", getenv("HOME")) > sizeof(ipfs_full_data_folder)) { + av_log(h, AV_LOG_ERROR, "The IPFS data path exceeds the max path length (%li)\n", sizeof(ipfs_full_data_folder)); + ret = AVERROR(EINVAL); + goto err; + } + + // Stat the folder. + // It should exist in a default IPFS setup when run as local user. +#ifndef _WIN32 + stat_ret = stat(ipfs_full_data_folder, &st); +#else + stat_ret = win32_stat(ipfs_full_data_folder, &st); +#endif + if (stat_ret < 0) { + av_log(h, AV_LOG_INFO, "Unable to find IPFS folder. We tried:\n"); + av_log(h, AV_LOG_INFO, "- $IPFS_PATH, which was empty.\n"); + av_log(h, AV_LOG_INFO, "- $HOME/.ipfs (full uri: %s) which doesn't exist.\n", ipfs_full_data_folder); + ret = AVERROR(ENOENT); + goto err; + } + } else + snprintf(ipfs_full_data_folder, sizeof(ipfs_full_data_folder), "%s", + getenv("IPFS_PATH")); + + // Copy the fully composed gateway path into ipfs_gateway_file. + if (snprintf(ipfs_gateway_file, sizeof(gateway_file_data), "%sgateway", + ipfs_full_data_folder) > sizeof(ipfs_gateway_file)) { + av_log(h, AV_LOG_ERROR, "The IPFS gateway file path exceeds the max path length (%li)\n", sizeof(ipfs_gateway_file)); + ret = AVERROR(ENOENT); + goto err; + } + + // Get the contents of the gateway file. + gateway_file = av_fopen_utf8(ipfs_gateway_file, "r"); + if (!gateway_file) { + av_log(h, AV_LOG_ERROR, "The IPFS gateway file (full uri: %s) doesn't exist. Is the gateway enabled?\n", ipfs_gateway_file); + ret = AVERROR(ENOENT); + goto err; + } + + // Read a single line (fgets stops at new line mark). + fgets(gateway_file_data, sizeof(gateway_file_data) - 1, gateway_file); + + // Replace the last char with \0 + gateway_file_data[sizeof(gateway_file_data) - 1] = 0; + + // Replace first occurence of end of line with \0 + gateway_file_data[strcspn(gateway_file_data, "\r")] = 0; + gateway_file_data[strcspn(gateway_file_data, "\n")] = 0; + + // If strlen finds anything longer then 0 characters then we have a + // potential gateway url. + if (strlen(gateway_file_data) < 1) { + av_log(h, AV_LOG_ERROR, "The IPFS gateway file (full uri: %s) appears to be empty. Is the gateway started?\n", ipfs_gateway_file); + ret = AVERROR(EILSEQ); + goto err; + } + + // At this point gateway_file_data contains at least something. + // Copy it into c->gateway_buffer. + if (snprintf(c->gateway_buffer, sizeof(c->gateway_buffer), "%s", + gateway_file_data) > 0) { + ret = 1; + goto err; + } else + av_log(h, AV_LOG_DEBUG, "Unknown error in the IPFS gateway file.\n"); + +err: + if (gateway_file) + fclose(gateway_file); + + return ret; +} + +// For now just makes sure that the c->gateway_buffer ends in url we expect. +// Like http://localhost:8080/. +// Explicitly with the traling slash. +static int sanitize_ipfs_gateway(URLContext *h) +{ + IPFSGatewayContext *c = h->priv_data; + const char *url_without_protocol; + int ret = 1; + + // Test if the gateway starts with either http:// or https:// + // The remainder is stored in url_without_protocol + if (av_stristart(c->gateway_buffer, "http://", &url_without_protocol) == 0 + && av_stristart(c->gateway_buffer, "https://", &url_without_protocol) == 0) { + av_log(h, AV_LOG_ERROR, "The gateway URL didn't start with http:// or https:// and is therefore invalid.\n"); + ret = AVERROR(EILSEQ); + goto err; + } + + // We now know the remainder of the url without the protocol. Check it for + // some length. At least 1 character. + if (strlen(url_without_protocol) < 1) { + av_log(h, AV_LOG_ERROR, "The gateway url (without the protocol part) is too short to be a valid URL.\n"); + ret = AVERROR(EILSEQ); + goto err; + } + + if (c->gateway_buffer[strlen(c->gateway_buffer) - 1] != '/' && + strlen(c->gateway_buffer) < (sizeof(c->gateway_buffer) - 1)) { + // Add a "/". strncat also takes care of adding a null terminating character. + strncat(c->gateway_buffer, "/", + sizeof(c->gateway_buffer) - strlen(c->gateway_buffer) - 1); + ret = 1; + goto err; + } + +err: + return ret; +} + +static int translate_ipfs_to_http(URLContext *h, const char *uri, + int flags, AVDictionary **options) +{ + const char *ipfs_cid; + char *fulluri = NULL; + int ret; + IPFSGatewayContext *c = h->priv_data; + + // Test for ipfs://, ipfs:, ipns:// and ipns:. This prefix is stripped from + // the string leaving just the CID in ipfs_cid. + int is_ipfs = av_stristart(uri, "ipfs://", &ipfs_cid); + int is_ipns = av_stristart(uri, "ipns://", &ipfs_cid); + + // We must have either ipns or ipfs. + if (!is_ipfs && !is_ipns) { + ret = AVERROR(EINVAL); + av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri); + goto err; + } + + // Pppulate c->gateway_buffer with whatever is in c->gateway + if (c->gateway != NULL) + snprintf(c->gateway_buffer, sizeof(c->gateway_buffer), "%s", c->gateway); + else + c->gateway_buffer[0] = '\0'; + + // Only do the auto detection logic if the gateway_buffer is empty + if (c->gateway_buffer[0] == '\0') { + // Populate the IPFS gateway if we have any. + // If not, inform the user how to properly set one. + ret = populate_ipfs_gateway(h); + + if (ret < 1) { + av_log(h, AV_LOG_ERROR, "No IPFS gateway was set. Make sure a local IPFS instance is running.\n"); + av_log(h, AV_LOG_INFO, "There are multiple options to define this gateway. The below options are in order of precedence:\n"); + av_log(h, AV_LOG_INFO, "1. Define a -gateway to the gateway without trailing forward slash.\n"); + av_log(h, AV_LOG_INFO, "2. Define $IPFS_GATEWAY with the full http link to the gateway without trailing forward slash.\n"); + av_log(h, AV_LOG_INFO, "3. Define $IPFS_PATH and point it to the IPFS data path.\n"); + av_log(h, AV_LOG_INFO, "4. Have IPFS running in your local user folder (under $HOME/.ipfs).\n"); + av_log(h, AV_LOG_INFO, "In all path cases, a file named gateway is expected. See https://github.com/ipfs/specs/issues/261 for more information.\n"); + goto err; + } + } + + // Sanitize the gateway to a format we expect. + ret = sanitize_ipfs_gateway(h); + + if (ret < 1) + goto err; + + // Concatenate the url. + // This ends up with something like: http://localhost:8080/ipfs/Qm..... + fulluri = av_asprintf("%s%s%s", c->gateway_buffer, + (is_ipns) ? "ipns/" : "ipfs/", + ipfs_cid); + + // Pass the URL back to FFMpeg's protocol handler. + if ((ret = ffurl_open_whitelist(&c->inner, 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", fulluri); + goto err; + } + +err: + av_free(fulluri); + return ret; +} + +static int ipfs_read(URLContext *h, unsigned char *buf, int size) +{ + IPFSGatewayContext *c = h->priv_data; + return ffurl_read(c->inner, buf, size); +} + +static int64_t ipfs_seek(URLContext *h, int64_t pos, int whence) +{ + IPFSGatewayContext *c = h->priv_data; + return ffurl_seek(c->inner, pos, whence); +} + +static int ipfs_close(URLContext *h) +{ + IPFSGatewayContext *c = h->priv_data; + av_free(c->gateway); + return ffurl_closep(&c->inner); +} + +#define OFFSET(x) offsetof(IPFSGatewayContext, x) + +static const AVOption options[] = { + {"gateway", "The gateway to ask for IPFS data.", OFFSET(gateway), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM}, + {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 = translate_ipfs_to_http, + .url_read = ipfs_read, + .url_seek = ipfs_seek, + .url_close = ipfs_close, + .priv_data_size = sizeof(IPFSGatewayContext), + .priv_data_class = &ipfs_context_class, +}; + +const URLProtocol ff_ipns_protocol = { + .name = "ipns", + .url_open2 = translate_ipfs_to_http, + .url_read = ipfs_read, + .url_seek = ipfs_seek, + .url_close = ipfs_close, + .priv_data_size = sizeof(IPFSGatewayContext), + .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"