我需要使用所有请求参数生成签名验证:
所以,我写了一个小的SignatureInterceptor类:
public class SignatureInterceptor implements Interceptor {
private String token;
private String signature = "";
private String method;
private String query;
public SignatureInterceptor() {
this.token = "456456456456";
}
@Override
public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
Request originalRequest = chain.request();
if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
return chain.proceed(originalRequest);
}
method = originalRequest.method();
query = originalRequest.urlString();
Request authenticatedRequest = originalRequest.newBuilder()
.method(originalRequest.method(), authenticate(originalRequest.body()))
.addHeader("signature", signature)
.build();
return chain.proceed(authenticatedRequest);
}
private RequestBody authenticate(final RequestBody body) {
return new RequestBody() {
@Override
public MediaType contentType() {
return body.contentType();
}
@Override
public long contentLength() throws IOException {
return -1;
}
@Override
public void writeTo(BufferedSink sink) throws IOException {
BufferedSink authSink = Okio.buffer(sink);
body.writeTo(sink);
String data = authSink.buffer().readUtf8();
signature = generateSignature(method, query, data, token);
authSink.close();
}
};
}
}
问题是,对于intercetors,结果在执行期间流式传输,因此在处理之前我无法获得签名值。
那么,有没有一种聪明的方法可以在头文件中插入writeTo()流方法中生成的签名值?
根据@Jesse的回答更新代码。
private class SignatureInterceptor implements Interceptor {
@Override
public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
Request originalRequest = chain.request();
String data = "";
if (originalRequest.body() != null) {
BufferedSink authSink = new Buffer();
originalRequest.body().writeTo(authSink);
data = authSink.buffer().readUtf8();
authSink.close();
}
Request authenticatedRequest = originalRequest.newBuilder()
.addHeader(HEADER_SIGNATURE, buildSignature(data))
.build();
return chain.proceed(authenticatedRequest);
}
}
答案 0 :(得分:5)
您无需创建自己的RequestBody类;只有当你改变身体时才有必要。
将writeTo
方法的内容移至intercept
,以便在调用proceed
之前计算签名。使用该签名添加标题。