C# HttpClient target with decompression

Author: Atvaark

src/targets/csharp/httpclient.js

@@ -2,32 +2,80 @@
 
 var CodeBuilder = require('../../helpers/code-builder')
 
+function getDecompressionMethods (source) {
+  var acceptEncoding = source.allHeaders['accept-encoding']
+  if (!acceptEncoding) {
+    return [] // no decompression
+  }
+
+  var supportedMethods = {
+    gzip: 'DecompressionMethods.GZip',
+    deflate: 'DecompressionMethods.Deflate'
+  }
+  var methods = []
+  acceptEncoding.split(',').forEach(function (encoding) {
+    var match = /\s*([^;\s]+)/.exec(encoding)
+    if (match) {
+      var method = supportedMethods[match[1]]
+      if (method) {
+        methods.push(method)
+      }
+    }
+  })
+
+  return methods
+}
+
 module.exports = function (source, options) {
   var indentation = '    '
   var code = new CodeBuilder(indentation)
 
   var clienthandler = ''
-  if (source.allHeaders.cookie) {
-    clienthandler = 'new HttpClientHandler { UseCookies = false }'
+  var cookies = !!source.allHeaders.cookie
+  var decompressionMethods = getDecompressionMethods(source)
+  if (cookies || decompressionMethods.length) {
+    clienthandler = 'clientHandler'
+    code.push('var clientHandler = new HttpClientHandler')
+    code.push('{')
+    if (cookies) {
+      // enable setting the cookie header
+      code.push(1, 'UseCookies = false,')
+    }
+    if (decompressionMethods.length) {
+      // enable decompression for supported methods
+      code.push(1, 'AutomaticDecompression = %s,', decompressionMethods.join(' | '))
+    }
+    code.push('};')
   }
 
   code.push('var client = new HttpClient(%s);', clienthandler)
+
   code.push('var request = new HttpRequestMessage')
   code.push('{')
 
   var methods = [ 'GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'HEAD', 'OPTIONS', 'TRACE' ]
   var method = source.method.toUpperCase()
   if (method && (methods.indexOf(method) !== -1)) {
+    // buildin method
     method = `HttpMethod.${method[0]}${method.substring(1).toLowerCase()}`
   } else {
+    // custom method
     method = `new HttpMethod("${method}")`
   }
   code.push(1, 'Method = %s,', method)
 
   code.push(1, 'RequestUri = new Uri("%s"),', source.fullUrl)
 
   var headers = Object.keys(source.allHeaders).filter(function (header) {
-    return header !== 'content-type'
+    switch (header) {
+      case 'content-type':
+      case 'content-length':
+      case 'accept-encoding':
+        // skip these headers
+        return false
+      default:
+        return true
+    }
   })
   if (headers.length) {
     code.push(1, 'Headers =')
@@ -84,14 +132,16 @@ module.exports = function (source, options) {
         break
     }
   }
-
   code.push('};')
+
+  // send and read response
   code.push('using (var response = await client.SendAsync(request))')
   code.push('{')
   code.push(1, 'response.EnsureSuccessStatusCode();')
   code.push(1, 'var body = await response.Content.ReadAsStringAsync();')
   code.push(1, 'Console.WriteLine(body);')
   code.push('}')
+
   return code.join()
 }
 

test/fixtures/output/csharp/httpclient/cookies.cs

@@ -1,4 +1,8 @@
-var client = new HttpClient(new HttpClientHandler { UseCookies = false });
+var clientHandler = new HttpClientHandler
+{
+    UseCookies = false,
+};
+var client = new HttpClient(clientHandler);
 var request = new HttpRequestMessage
 {
     Method = HttpMethod.Post,

test/fixtures/output/csharp/httpclient/full.cs

@@ -1,4 +1,8 @@
-var client = new HttpClient(new HttpClientHandler { UseCookies = false });
+var clientHandler = new HttpClientHandler
+{
+    UseCookies = false,
+};
+var client = new HttpClient(clientHandler);
 var request = new HttpRequestMessage
 {
     Method = HttpMethod.Post,

test/fixtures/output/csharp/httpclient/multipart-file.cs

@@ -14,7 +14,7 @@
                 {
                     Name = "foo",
                     FileName = "test/fixtures/files/hello.txt",
-                },
+                }
             }
         },
     },

test/fixtures/output/csharp/httpclient/multipart-form-data.cs

@@ -12,7 +12,7 @@
                 ContentDisposition = new ContentDispositionHeaderValue("form-data")
                 {
                     Name = "foo",
-                },
+                }
             }
         },
     },