422 lines
17 KiB
Go
422 lines
17 KiB
Go
/**
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* @Author: Echo
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* @Author:1711788888@qq.com
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* @Date: 2021/5/27 19:11
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* @Desc: Transmission signature.
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*/
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package sign
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import (
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"bytes"
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"compress/zlib"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"errors"
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"io/ioutil"
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"strconv"
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"time"
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)
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/**
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*【功能说明】用于签发 TRTC 和 IM 服务中必须要使用的 UserSig 鉴权票据
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*
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*【参数说明】
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* sdkappid - 应用id
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* key - 计算 usersig 用的加密密钥,控制台可获取
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* userid - 用户id，限制长度为32字节，只允许包含大小写英文字母（a-zA-Z）、数字（0-9）及下划线和连词符。
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* expire - UserSig 票据的过期时间，单位是秒，比如 86400 代表生成的 UserSig 票据在一天后就无法再使用了。
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*/
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/**
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* Function: Used to issue UserSig that is required by the TRTC and IM services.
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*
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* Parameter description:
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* sdkappid - Application ID
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* userid - User ID. The value can be up to 32 bytes in length and contain letters (a-z and A-Z), digits (0-9), underscores (_), and hyphens (-).
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* key - The encryption key used to calculate usersig can be obtained from the console.
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* expire - UserSig expiration time, in seconds. For example, 86400 indicates that the generated UserSig will expire one day after being generated.
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*/
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func GenUserSig(sdkappid int, key string, userid string, expire int) (string, error) {
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return genSig(sdkappid, key, userid, expire, nil)
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}
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func GenUserSigWithBuf(sdkappid int, key string, userid string, expire int, buf []byte) (string, error) {
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return genSig(sdkappid, key, userid, expire, buf)
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}
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/**
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*【功能说明】
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* 用于签发 TRTC 进房参数中可选的 PrivateMapKey 权限票据。
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* PrivateMapKey 需要跟 UserSig 一起使用，但 PrivateMapKey 比 UserSig 有更强的权限控制能力：
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* - UserSig 只能控制某个 UserID 有无使用 TRTC 服务的权限，只要 UserSig 正确，其对应的 UserID 可以进出任意房间。
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* - PrivateMapKey 则是将 UserID 的权限控制的更加严格，包括能不能进入某个房间，能不能在该房间里上行音视频等等。
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* 如果要开启 PrivateMapKey 严格权限位校验，需要在【实时音视频控制台】=>【应用管理】=>【应用信息】中打开“启动权限密钥”开关。
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*
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*【参数说明】
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* sdkappid - 应用id。
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* key - 计算 usersig 用的加密密钥,控制台可获取。
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* userid - 用户id，限制长度为32字节，只允许包含大小写英文字母（a-zA-Z）、数字（0-9）及下划线和连词符。
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* expire - PrivateMapKey 票据的过期时间，单位是秒，比如 86400 生成的 PrivateMapKey 票据在一天后就无法再使用了。
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* roomid - 房间号，用于指定该 userid 可以进入的房间号
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* privilegeMap - 权限位，使用了一个字节中的 8 个比特位，分别代表八个具体的功能权限开关：
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* - 第 1 位：0000 0001 = 1，创建房间的权限
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* - 第 2 位：0000 0010 = 2，加入房间的权限
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* - 第 3 位：0000 0100 = 4，发送语音的权限
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* - 第 4 位：0000 1000 = 8，接收语音的权限
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* - 第 5 位：0001 0000 = 16，发送视频的权限
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* - 第 6 位：0010 0000 = 32，接收视频的权限
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* - 第 7 位：0100 0000 = 64，发送辅路（也就是屏幕分享）视频的权限
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* - 第 8 位：1000 0000 = 200，接收辅路（也就是屏幕分享）视频的权限
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* - privilegeMap == 1111 1111 == 255 代表该 userid 在该 roomid 房间内的所有功能权限。
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* - privilegeMap == 0010 1010 == 42 代表该 userid 拥有加入房间和接收音视频数据的权限，但不具备其他权限。
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*/
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/**
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* Function:
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* Used to issue PrivateMapKey that is optional for room entry.
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* PrivateMapKey must be used together with UserSig but with more powerful permission control capabilities.
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* - UserSig can only control whether a UserID has permission to use the TRTC service. As long as the UserSig is correct, the user with the corresponding UserID can enter or leave any room.
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* - PrivateMapKey specifies more stringent permissions for a UserID, including whether the UserID can be used to enter a specific room and perform audio/video upstreaming in the room.
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* To enable stringent PrivateMapKey permission bit verification, you need to enable permission key in TRTC console > Application Management > Application Info.
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*
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* Parameter description:
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* sdkappid - Application ID
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* userid - User ID. The value can be up to 32 bytes in length and contain letters (a-z and A-Z), digits (0-9), underscores (_), and hyphens (-).
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* key - The encryption key used to calculate usersig can be obtained from the console.
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* roomid - ID of the room to which the specified UserID can enter.
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* expire - PrivateMapKey expiration time, in seconds. For example, 86400 indicates that the generated PrivateMapKey will expire one day after being generated.
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* privilegeMap - Permission bits. Eight bits in the same byte are used as the permission switches of eight specific features:
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* - Bit 1: 0000 0001 = 1, permission for room creation
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* - Bit 2: 0000 0010 = 2, permission for room entry
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* - Bit 3: 0000 0100 = 4, permission for audio sending
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* - Bit 4: 0000 1000 = 8, permission for audio receiving
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* - Bit 5: 0001 0000 = 16, permission for video sending
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* - Bit 6: 0010 0000 = 32, permission for video receiving
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* - Bit 7: 0100 0000 = 64, permission for substream video sending (screen sharing)
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* - Bit 8: 1000 0000 = 200, permission for substream video receiving (screen sharing)
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* - privilegeMap == 1111 1111 == 255: Indicates that the UserID has all feature permissions of the room specified by roomid.
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* - privilegeMap == 0010 1010 == 42: Indicates that the UserID has only the permissions to enter the room and receive audio/video data.
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*/
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func GenPrivateMapKey(sdkappid int, key string, userid string, expire int, roomid uint32, privilegeMap uint32) (string, error) {
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var userbuf []byte = genUserBuf(userid, sdkappid, roomid, expire, privilegeMap, 0, "")
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return genSig(sdkappid, key, userid, expire, userbuf)
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}
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/**
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*【功能说明】
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* 用于签发 TRTC 进房参数中可选的 PrivateMapKey 权限票据。
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* PrivateMapKey 需要跟 UserSig 一起使用，但 PrivateMapKey 比 UserSig 有更强的权限控制能力：
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* - UserSig 只能控制某个 UserID 有无使用 TRTC 服务的权限，只要 UserSig 正确，其对应的 UserID 可以进出任意房间。
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* - PrivateMapKey 则是将 UserID 的权限控制的更加严格，包括能不能进入某个房间，能不能在该房间里上行音视频等等。
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* 如果要开启 PrivateMapKey 严格权限位校验，需要在【实时音视频控制台】=>【应用管理】=>【应用信息】中打开“启动权限密钥”开关。
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*
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*【参数说明】
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* sdkappid - 应用id。
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* key - 计算 usersig 用的加密密钥,控制台可获取。
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* userid - 用户id，限制长度为32字节，只允许包含大小写英文字母（a-zA-Z）、数字（0-9）及下划线和连词符。
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* expire - PrivateMapKey 票据的过期时间，单位是秒，比如 86400 生成的 PrivateMapKey 票据在一天后就无法再使用了。
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* roomStr - 字符串房间号，用于指定该 userid 可以进入的房间号
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* privilegeMap - 权限位，使用了一个字节中的 8 个比特位，分别代表八个具体的功能权限开关：
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* - 第 1 位：0000 0001 = 1，创建房间的权限
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* - 第 2 位：0000 0010 = 2，加入房间的权限
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* - 第 3 位：0000 0100 = 4，发送语音的权限
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* - 第 4 位：0000 1000 = 8，接收语音的权限
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* - 第 5 位：0001 0000 = 16，发送视频的权限
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* - 第 6 位：0010 0000 = 32，接收视频的权限
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* - 第 7 位：0100 0000 = 64，发送辅路（也就是屏幕分享）视频的权限
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* - 第 8 位：1000 0000 = 200，接收辅路（也就是屏幕分享）视频的权限
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* - privilegeMap == 1111 1111 == 255 代表该 userid 在该 roomid 房间内的所有功能权限。
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* - privilegeMap == 0010 1010 == 42 代表该 userid 拥有加入房间和接收音视频数据的权限，但不具备其他权限。
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*/
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/**
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* Function:
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* Used to issue PrivateMapKey that is optional for room entry.
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* PrivateMapKey must be used together with UserSig but with more powerful permission control capabilities.
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* - UserSig can only control whether a UserID has permission to use the TRTC service. As long as the UserSig is correct, the user with the corresponding UserID can enter or leave any room.
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* - PrivateMapKey specifies more stringent permissions for a UserID, including whether the UserID can be used to enter a specific room and perform audio/video upstreaming in the room.
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* To enable stringent PrivateMapKey permission bit verification, you need to enable permission key in TRTC console > Application Management > Application Info.
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*
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* Parameter description:
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* sdkappid - Application ID
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* userid - User ID. The value can be up to 32 bytes in length and contain letters (a-z and A-Z), digits (0-9), underscores (_), and hyphens (-).
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* key - The encryption key used to calculate usersig can be obtained from the console.
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* roomstr - ID of the room to which the specified UserID can enter.
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* expire - PrivateMapKey expiration time, in seconds. For example, 86400 indicates that the generated PrivateMapKey will expire one day after being generated.
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* privilegeMap - Permission bits. Eight bits in the same byte are used as the permission switches of eight specific features:
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* - Bit 1: 0000 0001 = 1, permission for room creation
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* - Bit 2: 0000 0010 = 2, permission for room entry
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* - Bit 3: 0000 0100 = 4, permission for audio sending
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* - Bit 4: 0000 1000 = 8, permission for audio receiving
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* - Bit 5: 0001 0000 = 16, permission for video sending
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* - Bit 6: 0010 0000 = 32, permission for video receiving
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* - Bit 7: 0100 0000 = 64, permission for substream video sending (screen sharing)
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* - Bit 8: 1000 0000 = 200, permission for substream video receiving (screen sharing)
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* - privilegeMap == 1111 1111 == 255: Indicates that the UserID has all feature permissions of the room specified by roomid.
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* - privilegeMap == 0010 1010 == 42: Indicates that the UserID has only the permissions to enter the room and receive audio/video data.
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*/
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func GenPrivateMapKeyWithStringRoomID(sdkappid int, key string, userid string, expire int, roomStr string, privilegeMap uint32) (string, error) {
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var userbuf []byte = genUserBuf(userid, sdkappid, 0, expire, privilegeMap, 0, roomStr)
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return genSig(sdkappid, key, userid, expire, userbuf)
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}
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func genUserBuf(account string, dwSdkappid int, dwAuthID uint32,
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dwExpTime int, dwPrivilegeMap uint32, dwAccountType uint32, roomStr string) []byte {
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offset := 0
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length := 1 + 2 + len(account) + 20 + len(roomStr)
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if len(roomStr) > 0 {
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length = length + 2
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}
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userBuf := make([]byte, length)
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//ver
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if len(roomStr) > 0 {
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userBuf[offset] = 1
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} else {
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userBuf[offset] = 0
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}
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offset++
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userBuf[offset] = (byte)((len(account) & 0xFF00) >> 8)
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offset++
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userBuf[offset] = (byte)(len(account) & 0x00FF)
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offset++
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for ; offset < len(account)+3; offset++ {
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userBuf[offset] = account[offset-3]
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}
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//dwSdkAppid
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userBuf[offset] = (byte)((dwSdkappid & 0xFF000000) >> 24)
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offset++
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userBuf[offset] = (byte)((dwSdkappid & 0x00FF0000) >> 16)
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offset++
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userBuf[offset] = (byte)((dwSdkappid & 0x0000FF00) >> 8)
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offset++
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userBuf[offset] = (byte)(dwSdkappid & 0x000000FF)
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offset++
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//dwAuthId
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userBuf[offset] = (byte)((dwAuthID & 0xFF000000) >> 24)
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offset++
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userBuf[offset] = (byte)((dwAuthID & 0x00FF0000) >> 16)
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offset++
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userBuf[offset] = (byte)((dwAuthID & 0x0000FF00) >> 8)
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offset++
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userBuf[offset] = (byte)(dwAuthID & 0x000000FF)
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offset++
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//dwExpTime now+300;
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currTime := time.Now().Unix()
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var expire = currTime + int64(dwExpTime)
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userBuf[offset] = (byte)((expire & 0xFF000000) >> 24)
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offset++
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userBuf[offset] = (byte)((expire & 0x00FF0000) >> 16)
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offset++
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userBuf[offset] = (byte)((expire & 0x0000FF00) >> 8)
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offset++
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userBuf[offset] = (byte)(expire & 0x000000FF)
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offset++
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//dwPrivilegeMap
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userBuf[offset] = (byte)((dwPrivilegeMap & 0xFF000000) >> 24)
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offset++
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userBuf[offset] = (byte)((dwPrivilegeMap & 0x00FF0000) >> 16)
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offset++
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userBuf[offset] = (byte)((dwPrivilegeMap & 0x0000FF00) >> 8)
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offset++
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userBuf[offset] = (byte)(dwPrivilegeMap & 0x000000FF)
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offset++
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//dwAccountType
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userBuf[offset] = (byte)((dwAccountType & 0xFF000000) >> 24)
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offset++
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userBuf[offset] = (byte)((dwAccountType & 0x00FF0000) >> 16)
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offset++
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userBuf[offset] = (byte)((dwAccountType & 0x0000FF00) >> 8)
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offset++
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userBuf[offset] = (byte)(dwAccountType & 0x000000FF)
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offset++
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if len(roomStr) > 0 {
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userBuf[offset] = (byte)((len(roomStr) & 0xFF00) >> 8)
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offset++
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userBuf[offset] = (byte)(len(roomStr) & 0x00FF)
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offset++
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for ; offset < length; offset++ {
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userBuf[offset] = roomStr[offset-(length-len(roomStr))]
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}
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}
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return userBuf
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}
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func hmacsha256(sdkappid int, key string, identifier string, currTime int64, expire int, base64UserBuf *string) string {
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var contentToBeSigned string
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contentToBeSigned = "TLS.identifier:" + identifier + "\n"
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contentToBeSigned += "TLS.sdkappid:" + strconv.Itoa(sdkappid) + "\n"
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contentToBeSigned += "TLS.time:" + strconv.FormatInt(currTime, 10) + "\n"
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contentToBeSigned += "TLS.expire:" + strconv.Itoa(expire) + "\n"
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if nil != base64UserBuf {
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contentToBeSigned += "TLS.userbuf:" + *base64UserBuf + "\n"
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}
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h := hmac.New(sha256.New, []byte(key))
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h.Write([]byte(contentToBeSigned))
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return base64.StdEncoding.EncodeToString(h.Sum(nil))
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}
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func genSig(sdkappid int, key string, identifier string, expire int, userbuf []byte) (string, error) {
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currTime := time.Now().Unix()
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sigDoc := make(map[string]interface{})
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sigDoc["TLS.ver"] = "2.0"
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sigDoc["TLS.identifier"] = identifier
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sigDoc["TLS.sdkappid"] = sdkappid
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sigDoc["TLS.expire"] = expire
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sigDoc["TLS.time"] = currTime
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var base64UserBuf string
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if nil != userbuf {
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base64UserBuf = base64.StdEncoding.EncodeToString(userbuf)
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sigDoc["TLS.userbuf"] = base64UserBuf
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sigDoc["TLS.sig"] = hmacsha256(sdkappid, key, identifier, currTime, expire, &base64UserBuf)
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} else {
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sigDoc["TLS.sig"] = hmacsha256(sdkappid, key, identifier, currTime, expire, nil)
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}
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data, err := json.Marshal(sigDoc)
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if err != nil {
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return "", err
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}
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var b bytes.Buffer
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w := zlib.NewWriter(&b)
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if _, err = w.Write(data); err != nil {
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return "", err
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}
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if err = w.Close(); err != nil {
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return "", err
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}
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return base64urlEncode(b.Bytes()), nil
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}
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// VerifyUserSig 检验UserSig在now时间点时是否有效
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// VerifyUserSig Check if UserSig is valid at now time
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func VerifyUserSig(sdkappid uint64, key string, userid string, usersig string, now time.Time) error {
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sig, err := newUserSig(usersig)
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if err != nil {
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return err
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}
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return sig.verify(sdkappid, key, userid, now, nil)
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}
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// VerifyUserSigWithBuf 检验带UserBuf的UserSig在now时间点是否有效
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// VerifyUserSigWithBuf Check if UserSig with UserBuf is valid at now
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func VerifyUserSigWithBuf(sdkappid uint64, key string, userid string, usersig string, now time.Time, userbuf []byte) error {
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sig, err := newUserSig(usersig)
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if err != nil {
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return err
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}
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return sig.verify(sdkappid, key, userid, now, userbuf)
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}
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type userSig struct {
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Version string `json:"TLS.ver,omitempty"`
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Identifier string `json:"TLS.identifier,omitempty"`
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SdkAppID uint64 `json:"TLS.sdkappid,omitempty"`
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Expire int64 `json:"TLS.expire,omitempty"`
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Time int64 `json:"TLS.time,omitempty"`
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UserBuf []byte `json:"TLS.userbuf,omitempty"`
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Sig string `json:"TLS.sig,omitempty"`
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}
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func newUserSig(usersig string) (userSig, error) {
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b, err := base64urlDecode(usersig)
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if err != nil {
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return userSig{}, err
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}
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r, err := zlib.NewReader(bytes.NewReader(b))
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if err != nil {
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return userSig{}, err
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}
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data, err := ioutil.ReadAll(r)
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if err != nil {
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return userSig{}, err
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}
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if err = r.Close(); err != nil {
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return userSig{}, err
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}
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var sig userSig
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if err = json.Unmarshal(data, &sig); err != nil {
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return userSig{}, nil
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}
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return sig, nil
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}
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func (u userSig) verify(sdkappid uint64, key string, userid string, now time.Time, userbuf []byte) error {
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if sdkappid != u.SdkAppID {
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return ErrSdkAppIDNotMatch
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}
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if userid != u.Identifier {
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return ErrIdentifierNotMatch
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}
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if now.Unix() > u.Time+u.Expire {
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return ErrExpired
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}
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if userbuf != nil {
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if u.UserBuf == nil {
|
||
return ErrUserBufTypeNotMatch
|
||
}
|
||
if !bytes.Equal(userbuf, u.UserBuf) {
|
||
return ErrUserBufNotMatch
|
||
}
|
||
} else if u.UserBuf != nil {
|
||
return ErrUserBufTypeNotMatch
|
||
}
|
||
if u.sign(key) != u.Sig {
|
||
return ErrSigNotMatch
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func (u userSig) sign(key string) string {
|
||
var sb bytes.Buffer
|
||
sb.WriteString("TLS.identifier:")
|
||
sb.WriteString(u.Identifier)
|
||
sb.WriteString("\n")
|
||
sb.WriteString("TLS.sdkappid:")
|
||
sb.WriteString(strconv.FormatUint(u.SdkAppID, 10))
|
||
sb.WriteString("\n")
|
||
sb.WriteString("TLS.time:")
|
||
sb.WriteString(strconv.FormatInt(u.Time, 10))
|
||
sb.WriteString("\n")
|
||
sb.WriteString("TLS.expire:")
|
||
sb.WriteString(strconv.FormatInt(u.Expire, 10))
|
||
sb.WriteString("\n")
|
||
if u.UserBuf != nil {
|
||
sb.WriteString("TLS.userbuf:")
|
||
sb.WriteString(base64.StdEncoding.EncodeToString(u.UserBuf))
|
||
sb.WriteString("\n")
|
||
}
|
||
|
||
h := hmac.New(sha256.New, []byte(key))
|
||
h.Write(sb.Bytes())
|
||
return base64.StdEncoding.EncodeToString(h.Sum(nil))
|
||
}
|
||
|
||
// 错误类型
|
||
var (
|
||
ErrSdkAppIDNotMatch = errors.New("sdk appid not match")
|
||
ErrIdentifierNotMatch = errors.New("identifier not match")
|
||
ErrExpired = errors.New("expired")
|
||
ErrUserBufTypeNotMatch = errors.New("userbuf type not match")
|
||
ErrUserBufNotMatch = errors.New("userbuf not match")
|
||
ErrSigNotMatch = errors.New("sig not match")
|
||
)
|