feat: accept queries in the format of application/graphql (#3293)

Author: MedHeikelBouzayene

src/core/http/request_handler.rs

@@ -91,6 +91,19 @@ pub async fn graphql_request<T: DeserializeOwned + GraphQLRequestLike>(
     let req_ctx = Arc::new(create_request_context(&req, app_ctx));
     let (req, body) = req.into_parts();
     let bytes = hyper::body::to_bytes(body).await?;
+    let bytes = if req.headers.get("content-type")
+        == Some(&HeaderValue::from_str("application/graphql")?)
+    {
+        let decoded_str = String::from_utf8_lossy(&bytes).clone();
+        let enriched_str = if decoded_str.contains("\\") {
+            format!(r#"{{"query": {} }}"#, decoded_str)
+        } else {
+            format!(r#"{{"query": {:?} }}"#, decoded_str)
+        };
+        hyper::body::to_bytes(enriched_str).await?
+    } else {
+        bytes
+    };
     let graphql_request = serde_json::from_slice::<T>(&bytes);
     match graphql_request {
         Ok(request) => {

tests/core/snapshots/content-type-graphql.md_0.snap

@@ -0,0 +1,19 @@
+---
+source: tests/core/spec.rs
+expression: response
+snapshot_kind: text
+---
+{
+  "status": 200,
+  "headers": {
+    "content-type": "application/json"
+  },
+  "body": {
+    "data": {
+      "user": {
+        "city": "Globe",
+        "name": "Tailcall"
+      }
+    }
+  }
+}

tests/core/snapshots/content-type-graphql.md_client.snap

@@ -0,0 +1,18 @@
+---
+source: tests/core/spec.rs
+expression: formatted
+snapshot_kind: text
+---
+type Query {
+  user(id: ID!): User!
+}
+
+type User {
+  city: String
+  id: ID!
+  name: String!
+}
+
+schema {
+  query: Query
+}

tests/core/snapshots/content-type-graphql.md_merged.snap

@@ -0,0 +1,22 @@
+---
+source: tests/core/spec.rs
+expression: formatter
+snapshot_kind: text
+---
+schema
+  @server(hostname: "0.0.0.0", port: 8001, queryValidation: false)
+  @upstream(httpCache: 42)
+  @link(src: "schema_0.graphql", type: Config) {
+  query: Query
+}
+
+type Query {
+  user(id: ID!): User!
+    @graphQL(args: [{key: "id", value: "{{.args.id}}"}], url: "http://upstream/graphql", name: "user")
+}
+
+type User {
+  city: String
+  id: ID!
+  name: String!
+}

tests/execution/content-type-graphql.md

@@ -0,0 +1,57 @@
+# Basic queries with field ordering check
+
+```yaml @config
+server:
+  port: 8001
+  hostname: "0.0.0.0"
+  queryValidation: false
+upstream:
+  httpCache: 42
+```
+
+```graphql @schema
+schema {
+  query: Query
+}
+
+type Query {
+  user(id: ID!): User!
+    @graphQL(url: "http://upstream/graphql", name: "user", args: [{key: "id", value: "{{.args.id}}"}])
+}
+
+type User {
+  id: ID!
+  name: String!
+  city: String
+}
+```
+
+```yml @mock
+- request:
+    method: POST
+    url: http://upstream/graphql
+    textBody: '{ "query": "query { user(id: 4) { city name } }" }'
+  expectedHits: 1
+  response:
+    status: 200
+    body:
+      data:
+        user:
+          city: Globe
+          name: Tailcall
+```
+
+```yml @test
+# Positive: basic 1
+- method: POST
+  url: http://localhost:8080/graphql
+  headers:
+    content-type: application/graphql
+  body: |
+    query {
+      user(id: 4) {
+        city
+        name
+      }
+    }
+```