move RetrieveFileAtPath to src/interactors/mod

Also add functions to both the `github` and `gitlab` modules for
constructing the Uri to the manifest

src/interactors/github.rs

@@ -11,46 +11,14 @@ use ::models::repo::{Repository, RepoPath};
 const GITHUB_API_BASE_URI: &'static str = "https://api.github.com";
 const GITHUB_USER_CONTENT_BASE_URI: &'static str = "https://raw.githubusercontent.com";
 
-#[derive(Debug, Clone)]
-pub struct RetrieveFileAtPath<S>(pub S);
-
-impl<S> Service for RetrieveFileAtPath<S>
-    where S: Service<Request=Request, Response=Response, Error=HyperError> + Clone + 'static,
-          S::Future: 'static
-{
-    type Request = (RepoPath, RelativePathBuf);
-    type Response = String;
-    type Error = Error;
-    type Future = Box<Future<Item=Self::Response, Error=Self::Error>>;
-
-    fn call(&self, req: Self::Request) -> Self::Future {
-        let service = self.0.clone();
-
-        let (repo_path, path) = req;
+pub fn get_manifest_uri(repo_path: &RepoPath, path: &RelativePathBuf) -> Result<Uri, ::hyper::error::UriError> {
     let path_str: &str = path.as_ref();
-        let uri_future = format!("{}/{}/{}/HEAD/{}",
+    Ok(format!("{}/{}/{}/HEAD/{}",
         GITHUB_USER_CONTENT_BASE_URI,
         repo_path.qual.as_ref(),
         repo_path.name.as_ref(),
         path_str
-        ).parse::<Uri>().into_future().from_err();
-
-        Box::new(uri_future.and_then(move |uri| {
-            let request = Request::new(Method::Get, uri.clone());
-
-            service.call(request).from_err().and_then(move |response| {
-                let status = response.status();
-                if !status.is_success() {
-                    future::Either::A(future::err(format_err!("Status code {} for URI {}", status, uri)))
-                } else {
-                    let body_future = response.body().concat2().from_err();
-                    let decode_future = body_future
-                        .and_then(|body| String::from_utf8(body.to_vec()).map_err(|err| err.into()));
-                    future::Either::B(decode_future)
-                }
-            })
-        }))
-    }
+    ).parse::<Uri>()?)
 }
 
 #[derive(Deserialize)]

src/interactors/gitlab.rs

@@ -0,0 +1,23 @@
+use hyper::Uri;
+use relative_path::RelativePathBuf;
+
+use ::models::repo::RepoPath;
+
+const GITLAB_USER_CONTENT_BASE_URI: &'static str = "https://gitlab.com";
+
+pub fn get_manifest_uri(repo_path: &RepoPath, path: &RelativePathBuf) -> Result<Uri, ::hyper::error::UriError> {
+    let path_str: &str = path.as_ref();
+    // gitlab will return a 308 if the Uri ends with, say, `.../raw/master//Cargo.toml`, so make
+    // sure that last slash isn't doubled
+    let slash_path = if path_str.starts_with("/") {
+        &path_str[1..]
+    } else {
+        path_str
+    };
+    format!("{}/{}/{}/raw/master/{}",
+        GITLAB_USER_CONTENT_BASE_URI,
+        repo_path.qual.as_ref(),
+        repo_path.name.as_ref(),
+        slash_path
+    ).parse::<Uri>()
+}

src/interactors/mod.rs

@@ -1,2 +1,58 @@
+use failure::Error;
+use futures::{Future, IntoFuture, Stream, future};
+use hyper::{Error as HyperError, Method, Request, Response};
+use relative_path::RelativePathBuf;
+use tokio_service::Service;
+
+use ::models::repo::{RepoSite, RepoPath};
+
 pub mod crates;
 pub mod github;
+pub mod gitlab;
+
+
+#[derive(Debug, Clone)]
+pub struct RetrieveFileAtPath<S>(pub S);
+
+impl<S> Service for RetrieveFileAtPath<S>
+    where S: Service<Request=Request, Response=Response, Error=HyperError> + Clone + 'static,
+          S::Future: 'static
+{
+    type Request = (RepoPath, RelativePathBuf);
+    type Response = String;
+    type Error = Error;
+    type Future = Box<Future<Item=Self::Response, Error=Self::Error>>;
+
+    fn call(&self, req: Self::Request) -> Self::Future {
+        let service = self.0.clone();
+
+        let (repo_path, path) = req;
+        let uri = match &repo_path.site {
+            &RepoSite::Github => {
+                github::get_manifest_uri(&repo_path, &path)
+            },
+            &RepoSite::Gitlab => {
+                gitlab::get_manifest_uri(&repo_path, &path)
+            },
+        };
+        let uri_future = uri.into_future().from_err();
+
+        Box::new(uri_future.and_then(move |uri| {
+            let request = Request::new(Method::Get, uri.clone());
+
+            service.call(request).from_err().and_then(move |response| {
+                let status = response.status();
+                if !status.is_success() {
+                    future::Either::A(future::err(format_err!("Status code {} for URI {}", status, uri)))
+                } else {
+                    let body_future = response.body().concat2().from_err();
+                    let decode_future = body_future
+                        .and_then(|body| String::from_utf8(body.to_vec()).map_err(|err| err.into()));
+                    future::Either::B(decode_future)
+                }
+            })
+        }))
+    }
+}
+
+