Question

我正在尝试从命令行在last.fm上的一个播放列表中添加“艺术家 - 歌曲”条目。

我申请了一个API密钥并获得了last.fm API documentation中描述的会话密钥。我使用user.getplaylist（$ PLID）获得了播放列表ID。

该服务要求客户端将数据作为POST请求发送给写入任何内容的方法。为此，我决定使用curl -d

以下是add_track.sh的内容：

    SERVICE=http://ws.audioscrobbler.com/2.0/
    APIKEY=1dfdc3a278e6bac5c76442532fcd6a05 # mpc-last
    SECRET=<md5hash: api secret>
    LASTFM_USER=<string: myuser> 
    LASTFM_SK=<md5hash: valid session key> 

    # parameters (sorted alphabetically becasue method signature requires them to be)
    # api_key (Required) : A Last.fm API key.
    # api_sig (Required) : A Last.fm method signature. See authentication for more information.
    # artist (Required) : The artist name that corresponds to the track to be added.
    # method playlist.addTrack
    # playlistID (Required) : The ID of the playlist - this is available in user.getPlaylists.
    # sk (Required) : A session key generated by authenticating a user via the authentication protocol. 
    # track (Required) : The track name to add to the playlist.

    METHOD=playlist.addtrack
    ARTIST=prodigy
    TRACK=breathe
    PLID=8698647

    MS="api_key${APIKEY}"                                                                               # api_sig can't be here because it's not produced yet, obviously
    MS="${MS}artist${ARTIST}"                                                                           MS="${MS}method${METHOD}"                                                                           MS="${MS}playlistid${PLID}" # tried with playlistID too
    MS="${MS}track${TRACK}"                
    #MS="${MS}sk${LASTFM_SK}" # including this does not help
    MS="${MS}${SECRET}"

    # hash it
    MS=`echo -n  $MS | md5sum | cut -d' ' -f1`

    # call the service. 
    # args also sorted alphabetically, but this should definitely not matter
    curl \ 
     -d api_key=${APIKEY} \
     -d api_sig=${MS} \
     -d artist=${ARTIST} \
     -d method=${METHOD} \
     -d playlistID=${PLID} \
     -d sk=${LASTFM_SK} \
     -d track=${TRACK}  \
    $SERVICE

然后我打电话给服务：

$ ./add_track.sh 
<?xml version="1.0" encoding="utf-8"?>
<lfm status="failed">
<error code="13">Invalid method signature supplied</error></lfm>

Answer 1

供参考：

curl -v \
    -d    "api_key=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${APIKEY}`"    \   
    -d    "api_sig=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${MS}`"        \
    -d     "artist=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${ARTIST}`"    \
    -d     "method=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${METHOD}`"    \
    -d "playlistID=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${PLID}`"      \
    -d         "sk=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${LASTFM_SK}`" \
    -d      "track=`perl -e 'use Encode; printf "%s", encode_utf8($ARGV[0])' ${TRACK} `"    \
$SE

.... 一个人可能最好从一开始就使用perl： http://www.easyclasspage.de/lastfm/seite-11.html

Last.fm无效方法签名（playlist.addTrack）

1 个答案: