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/*

 * Copyright (c) 2013 Lukasz Marek 

 *

 * 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 

#include 

#include "libavutil/avstring.h"

#include "libavutil/opt.h"

#include "avformat.h"

#include "internal.h"

#include "url.h"

typedef struct {

    const AVClass *class;

    ssh_session session;

    sftp_session sftp;

    sftp_file file;

    int64_t filesize;

    int rw_timeout;

    int trunc;

} LIBSSHContext;

static int libssh_close(URLContext *h)

{

    LIBSSHContext *s = h->priv_data;

    if (s->file)

        sftp_close(s->file);

    if (s->sftp)

        sftp_free(s->sftp);

    if (s->session) {

        ssh_disconnect(s->session);

        ssh_free(s->session);

    }

    return 0;

}

static int libssh_open(URLContext *h, const char *url, int flags)

{

    static const int verbosity = SSH_LOG_NOLOG;

    LIBSSHContext *s = h->priv_data;

    char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024];

    int port = 22, access, ret;

    long timeout = s->rw_timeout * 1000;

    const char *user = NULL, *pass = NULL;

    char *end = NULL;

    sftp_attributes stat;

    av_url_split(proto, sizeof(proto),

                 credencials, sizeof(credencials),

                 hostname, sizeof(hostname),

                 &port,

                 path, sizeof(path),

                 url);

    if (port <= 0 || port > 65535)

        port = 22;

    if (!(s->session = ssh_new())) {

        ret = AVERROR(ENOMEM);

        goto fail;

    }

    user = av_strtok(credencials, ":", &end);

    pass = av_strtok(end, ":", &end);

    ssh_options_set(s->session, SSH_OPTIONS_HOST, hostname);

    ssh_options_set(s->session, SSH_OPTIONS_PORT, &port);

    ssh_options_set(s->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);

    if (timeout > 0)

        ssh_options_set(s->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout);

    if (user)

        ssh_options_set(s->session, SSH_OPTIONS_USER, user);

    if (ssh_connect(s->session) != SSH_OK) {

        av_log(h, AV_LOG_ERROR, "Connection failed. %s\n", ssh_get_error(s->session));

        ret = AVERROR(EIO);

        goto fail;

    }

    if (pass && ssh_userauth_password(s->session, NULL, pass) != SSH_AUTH_SUCCESS) {

        av_log(h, AV_LOG_ERROR, "Error authenticating with password: %s\n", ssh_get_error(s->session));

        ret = AVERROR(EACCES);

        goto fail;

    }

    if (!(s->sftp = sftp_new(s->session))) {

        av_log(h, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(s->session));

        ret = AVERROR(ENOMEM);

        goto fail;

    }

    if (sftp_init(s->sftp) != SSH_OK) {

        av_log(h, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(s->session));

        ret = AVERROR(EIO);

        goto fail;

    }

    if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {

        access = O_CREAT | O_RDWR;

        if (s->trunc)

            access |= O_TRUNC;

    } else if (flags & AVIO_FLAG_WRITE) {

        access = O_CREAT | O_WRONLY;

        if (s->trunc)

            access |= O_TRUNC;

    } else {

        access = O_RDONLY;

    }

    if (!(s->file = sftp_open(s->sftp, path, access, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH))) {

        av_log(h, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(s->session));

        ret = AVERROR(EIO);

        goto fail;

    }

    if (!(stat = sftp_fstat(s->file))) {

        av_log(h, AV_LOG_WARNING, "Cannot stat remote file %s.\n", path);

        s->filesize = -1;

    } else {

        s->filesize = stat->size;

        sftp_attributes_free(stat);

    }

    return 0;

  fail:

    libssh_close(h);

    return ret;

}

static int64_t libssh_seek(URLContext *h, int64_t pos, int whence)

{

    LIBSSHContext *s = h->priv_data;

    int64_t newpos;

    if (s->filesize == -1 && (whence == AVSEEK_SIZE || whence == SEEK_END)) {

        av_log(h, AV_LOG_ERROR, "Error during seeking.\n");

        return AVERROR(EIO);

    }

    switch(whence) {

    case AVSEEK_SIZE:

        return s->filesize;

    case SEEK_SET:

        newpos = pos;

        break;

    case SEEK_CUR:

        newpos = sftp_tell64(s->file);

        break;

    case SEEK_END:

        newpos = s->filesize + pos;

        break;

    default:

        return AVERROR(EINVAL);

    }

    if (sftp_seek64(s->file, newpos)) {

        av_log(h, AV_LOG_ERROR, "Error during seeking.\n");

        return AVERROR(EIO);

    }

    return newpos;

}

static int libssh_read(URLContext *h, unsigned char *buf, int size)

{

    LIBSSHContext *s = h->priv_data;

    int bytes_read;

    if ((bytes_read = sftp_read(s->file, buf, size)) < 0) {

        av_log(h, AV_LOG_ERROR, "Read error.\n");

        return AVERROR(EIO);

    }

    return bytes_read;

}

static int libssh_write(URLContext *h, const unsigned char *buf, int size)

{

    LIBSSHContext *s = h->priv_data;

    int bytes_written;

    if ((bytes_written = sftp_write(s->file, buf, size)) < 0) {

        av_log(h, AV_LOG_ERROR, "Write error.\n");

        return AVERROR(EIO);

    }

    return bytes_written;

}

#define OFFSET(x) offsetof(LIBSSHContext, x)

#define D AV_OPT_FLAG_DECODING_PARAM

#define E AV_OPT_FLAG_ENCODING_PARAM

static const AVOption options[] = {

    {"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },

    {"truncate", "Truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },

    {NULL}

};

static const AVClass libssh_context_class = {

    .class_name     = "libssh",

    .item_name      = av_default_item_name,

    .option         = options,

    .version        = LIBAVUTIL_VERSION_INT,

};

URLProtocol ff_libssh_protocol = {

    .name                = "sftp",

    .url_open            = libssh_open,

    .url_read            = libssh_read,

    .url_write           = libssh_write,

    .url_seek            = libssh_seek,

    .url_close           = libssh_close,

    .priv_data_size      = sizeof(LIBSSHContext),

    .priv_data_class     = &libssh_context_class,

    .flags               = URL_PROTOCOL_FLAG_NETWORK,

};