Add bson crate's ObjectId to juniper foreign scalar type integrations (#517)

Author: iancormac84

README.md

@@ -67,6 +67,7 @@ your Schemas automatically.
 - [uuid][uuid]
 - [url][url]
 - [chrono][chrono]
+- [bson][bson]
 
 ### Web Frameworks
 
@@ -105,4 +106,5 @@ Juniper has not reached 1.0 yet, thus some API instability should be expected.
 [uuid]: https://crates.io/crates/uuid
 [url]: https://crates.io/crates/url
 [chrono]: https://crates.io/crates/chrono
+[bson]: https://crates.io/crates/bson
 [juniper-from-schema]: https://github.com/davidpdrsn/juniper-from-schema

docs/book/content/README.md

@@ -41,6 +41,7 @@ your Schemas automatically.
 - [uuid][uuid]
 - [url][url]
 - [chrono][chrono]
+- [bson][bson]
 
 ### Web Frameworks
 
@@ -72,3 +73,4 @@ Juniper has not reached 1.0 yet, thus some API instability should be expected.
 [uuid]: https://crates.io/crates/uuid
 [url]: https://crates.io/crates/url
 [chrono]: https://crates.io/crates/chrono
+[bson]: https://crates.io/crates/bson

docs/book/content/types/scalars.md

@@ -35,6 +35,7 @@ crates. They are enabled via features that are on by default.
 * uuid::Uuid
 * chrono::DateTime
 * url::Url
+* bson::oid::ObjectId
 
 ## newtype pattern
 

juniper/Cargo.toml

@@ -27,6 +27,7 @@ path = "benches/bench.rs"
 async = ["juniper_codegen/async", "futures"]
 expose-test-schema = []
 default = [
+    "bson",
     "chrono",
     "url",
     "uuid",
@@ -35,6 +36,7 @@ default = [
 [dependencies]
 juniper_codegen = { version = "0.14.2", path = "../juniper_codegen"  }
 
+bson = { version = "0.14.0", optional = true }
 chrono = { version = "0.4.0", optional = true }
 fnv = "1.0.3"
 futures = { version = "0.3.1", optional = true }

juniper/src/integrations/mod.rs

@@ -13,3 +13,7 @@ pub mod url;
 #[cfg(feature = "uuid")]
 /// GraphQL support for [uuid](https://doc.rust-lang.org/uuid/uuid/struct.Uuid.html) types.
 pub mod uuid;
+
+#[cfg(feature = "bson")]
+/// GraphQL support for [bson](https://github.com/mongodb/bson-rust) types.
+pub mod objectid;

juniper/src/integrations/objectid.rs

@@ -0,0 +1,45 @@
+use bson::oid::ObjectId;
+
+use crate::{
+    parser::{ParseError, ScalarToken, Token},
+    value::ParseScalarResult,
+    Value,
+};
+
+graphql_scalar!(ObjectId where Scalar = <S> {
+    description: "ObjectId"
+
+    resolve(&self) -> Value {
+        Value::scalar(self.to_hex())
+    }
+
+    from_input_value(v: &InputValue) -> Option<ObjectId> {
+        v.as_string_value()
+         .and_then(|s| ObjectId::with_string(s).ok())
+    }
+
+    from_str<'a>(value: ScalarToken<'a>) -> ParseScalarResult<'a, S> {
+        if let ScalarToken::String(value) = value {
+            Ok(S::from(value.to_owned()))
+        } else {
+            Err(ParseError::UnexpectedToken(Token::Scalar(value)))
+        }
+    }
+});
+
+#[cfg(test)]
+mod test {
+    use crate::{value::DefaultScalarValue, InputValue};
+    use bson::oid::ObjectId;
+
+    #[test]
+    fn objectid_from_input_value() {
+        let raw = "53e37d08776f724e42000000";
+        let input: InputValue<DefaultScalarValue> = InputValue::scalar(raw.to_string());
+
+        let parsed: ObjectId = crate::FromInputValue::from_input_value(&input).unwrap();
+        let id = ObjectId::with_string(raw).unwrap();
+
+        assert_eq!(parsed, id);
+    }
+}

juniper/src/lib.rs

@@ -59,6 +59,7 @@ your Schemas automatically.
 * [uuid][uuid]
 * [url][url]
 * [chrono][chrono]
+* [bson][bson]
 
 ### Web Frameworks
 
@@ -86,6 +87,7 @@ Juniper has not reached 1.0 yet, thus some API instability should be expected.
 [uuid]: https://crates.io/crates/uuid
 [url]: https://crates.io/crates/url
 [chrono]: https://crates.io/crates/chrono
+[bson]: https://crates.io/crates/bson
 
 */
 #![doc(html_root_url = "https://docs.rs/juniper/0.14.2")]
@@ -106,6 +108,9 @@ extern crate url;
 #[cfg(any(test, feature = "uuid"))]
 extern crate uuid;
 
+#[cfg(any(test, feature = "bson"))]
+extern crate bson;
+
 // Depend on juniper_codegen and re-export everything in it.
 // This allows users to just depend on juniper and get the derive
 // functionality automatically.