ktor HTTP API 练习

阳光穿透心脏的1/2处 2023-06-01 11:07 7阅读 0赞

## 练习一 ##

### Question ###

为每个片段添加唯一 id，并为 /snippets 添加一个 DELETE http 动词，以允许通过身份认证的用户删除自己的片段。

### Answer ###

首先为每个片段添加唯一 id：

data class Snippet(val id: Int, val user: String, val text: String)
    val snippets = Collections.synchronizedList(
        mutableListOf(
            Snippet(id = 1, user = "test", text = "hello"),
            Snippet(id = 2, user = "test", text = "world")
        )
    )

修改新增片段的post请求：

authenticate {
                    post {
                        val post = call.receive<PostSnippet>()
                        val principal = call.principal<UserIdPrincipal>() ?: error("No principal")
                        snippets += Snippet(snippets.size+1, principal.name, post.snippet.text)
                        call.respond(mapOf("OK" to true))
                    }
                }

先测试新增片段的请求是否正常，ID正确  
![394393-20190903232024111-468171764.png][]  
添加删除片段的delete请求：

authenticate {
                    delete("/{id}") {
                        val id = call.parameters["id"]
                        val snip = snippets.find { s -> s.id == id?.toInt() }
                        if (snip != null) {
                            snippets.remove(snip)
                            call.respond(mapOf("snippets" to synchronized(snippets) { snippets.toList() }))
                        }
                        else{
                            call.respond(mapOf("msg" to "no such id"))
                        }
                    }
                }

添加一个DELETE的HTTP请求测试

DELETE {
        {host}}/snippets/1
    Authorization: Bearer {
        {auth_token}}

返回结果如下，id为1的snippets已被删除  
![394393-20190903232920533-699126559.png][]

转载于:https://www.cnblogs.com/shy-/p/11456450.html

[394393-20190903232024111-468171764.png]: /images/20230601/89b561ea74804c68980d8003a435b6b2.png
[394393-20190903232920533-699126559.png]: /images/20230601/710c3c04ae914646ba83572954493a31.png