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/*
 * Tencent is pleased to support the open source community by making BK-CI 蓝鲸持续集成平台 available.
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 * Copyright (C) 2019 THL A29 Limited, a Tencent company.  All rights reserved.
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 * BK-CI 蓝鲸持续集成平台 is licensed under the MIT license.
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 * A copy of the MIT License is included in this file.
 *
 *
 * Terms of the MIT License:
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 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
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package com.tencent.devops.common.web.aop

import com.github.benmanes.caffeine.cache.Caffeine
import com.tencent.devops.common.api.auth.AUTH_HEADER_DEVOPS_BUILD_ID
import com.tencent.devops.common.api.auth.AUTH_HEADER_DEVOPS_VM_SEQ_ID
import com.tencent.devops.common.api.auth.SIGN_HEADER_NONCE
import com.tencent.devops.common.api.auth.SIGN_HEADER_TIMESTAMP
import com.tencent.devops.common.api.auth.SING_HEADER_SIGNATURE
import com.tencent.devops.common.api.constant.CommonMessageCode
import com.tencent.devops.common.api.exception.ErrorCodeException
import com.tencent.devops.common.client.Client
import com.tencent.devops.common.redis.RedisOperation
import com.tencent.devops.common.util.ApiSignUtil
import com.tencent.devops.common.web.annotation.SensitiveApiPermission
import com.tencent.devops.common.web.service.ServiceSensitiveApiPermissionResource
import com.tencent.devops.common.web.utils.AtomRuntimeUtil
import javax.servlet.http.HttpServletRequest
import org.aspectj.lang.JoinPoint
import org.aspectj.lang.annotation.Aspect
import org.aspectj.lang.annotation.Before
import org.aspectj.lang.annotation.Pointcut
import org.aspectj.lang.reflect.MethodSignature
import org.slf4j.LoggerFactory
import org.springframework.web.context.request.RequestContextHolder
import org.springframework.web.context.request.ServletRequestAttributes

@Aspect
class SensitiveApiPermissionAspect constructor(
    private val client: Client,
    private val redisOperation: RedisOperation,
    private val enableSensitiveApi: Boolean
) {

    @Pointcut("@annotation(com.tencent.devops.common.web.annotation.SensitiveApiPermission)")
    fun pointCut() = Unit

    private val apiPermissionCache = Caffeine.newBuilder()
        .maximumSize(CACHE_MAX_SIZE)
        .build()

    @Before("pointCut()")
    fun doBefore(jp: JoinPoint) {
        val request = (RequestContextHolder.getRequestAttributes() as ServletRequestAttributes).request
        val buildId = request.getHeader(AUTH_HEADER_DEVOPS_BUILD_ID)
        val vmSeqId = request.getHeader(AUTH_HEADER_DEVOPS_VM_SEQ_ID)
        val method = (jp.signature as MethodSignature).method
        val apiName = method.getAnnotation(SensitiveApiPermission::class.java)?.value

        val (atomCode, signToken) = if (buildId != null && vmSeqId != null) {
            AtomRuntimeUtil.getRunningAtomValue(
                redisOperation = redisOperation, buildId = buildId, vmSeqId = vmSeqId
            ) ?: Pair(null, null)
        } else {
            Pair(null, null)
        }

        if (apiName != null && atomCode != null) {
            logger.info("$buildId|$vmSeqId|$atomCode|$apiName|using sensitive api")
            if (enableSensitiveApi &&
                !verifyToken(request, signToken) &&
                !verifyApi(buildId, vmSeqId, atomCode, apiName)
            ) {
                logger.warn("$buildId|$vmSeqId|$atomCode|$apiName|verify sensitive api failed")
                throw ErrorCodeException(
                    statusCode = 401,
                    errorCode = CommonMessageCode.ERROR_SENSITIVE_API_NO_AUTH,
                    params = arrayOf(atomCode, apiName),
                    defaultMessage = "Unauthorized: sensitive api $apiName cannot be used by $atomCode"
                )
            }
        }
    }

    private fun verifyApi(
        buildId: String,
        vmSeqId: String,
        atomCode: String,
        apiName: String
    ): Boolean {
        val cacheKey = "$atomCode:$apiName"
        logger.info("buildId:$buildId|vmSeqId:$vmSeqId|atomCode:$atomCode|apiName:$apiName|verify sensitive api")
        return apiPermissionCache.getIfPresent(cacheKey) ?: run {
            val apiPermission = client.get(ServiceSensitiveApiPermissionResource::class).verifyApi(
                atomCode = atomCode,
                apiName = apiName
            ).data == true
            // 只有验证通过的插件才缓存,没有验证通过的插件状态是动态的
            if (apiPermission) {
                apiPermissionCache.put(cacheKey, true)
            }
            apiPermission
        }
    }

    private fun verifyToken(request: HttpServletRequest, signToken: String?): Boolean {
        val signature = request.getHeader(SING_HEADER_SIGNATURE)
        val timestamp = request.getHeader(SIGN_HEADER_TIMESTAMP)
        val nonce = request.getHeader(SIGN_HEADER_NONCE)
        val buildId = request.getHeader(AUTH_HEADER_DEVOPS_BUILD_ID)
        val vmSeqId = request.getHeader(AUTH_HEADER_DEVOPS_VM_SEQ_ID)
        val method = request.method
        val url = if (request.queryString.isNullOrBlank()) {
            request.requestURI
        } else {
            "${request.requestURI}?${request.queryString}"
        }
        // 如果没有签名头,则需要验证插件是否开通了接口权限
        if (isBlank(signature = signature, timestamp = timestamp, nonce = nonce, signToken = signToken)) {
            return false
        }
        val serverSign = ApiSignUtil.signToRequest(
            method = method,
            url = url,
            timestamp = timestamp,
            nonce = nonce,
            token = signToken!!
        )
        logger.info(
            "buildId:$buildId|vmSeqId:$vmSeqId|timestamp:$timestamp|" +
                "nonce:$nonce|signature:$signature|serverSign:$serverSign|verify sensitive api sign"
        )
        return serverSign == signature
    }

    private fun isBlank(signature: String?, timestamp: String?, nonce: String?, signToken: String?): Boolean {
        return signature.isNullOrBlank() ||
            timestamp.isNullOrBlank() ||
            nonce.isNullOrBlank() ||
            signToken.isNullOrBlank()
    }

    companion object {
        private val logger = LoggerFactory.getLogger(SensitiveApiPermissionAspect::class.java)
        private const val CACHE_MAX_SIZE = 1000L
    }
}




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