From 617083cce7956d8a27b3737c1ae857d080498935 Mon Sep 17 00:00:00 2001
From: chris <chris@c-mart.in>
Date: Fri, 24 May 2019 12:40:25 -0400
Subject: [PATCH] Pass all requests to OpenStack through proxy server

---
 src/Rest/Helpers.elm | 53 +++++++++++++++++++++++++++++++++++++++++---
 src/Rest/Rest.elm    | 18 ++++++++++-----
 2 files changed, 62 insertions(+), 9 deletions(-)

diff --git a/src/Rest/Helpers.elm b/src/Rest/Helpers.elm
index ba098233..9d7de4ca 100644
--- a/src/Rest/Helpers.elm
+++ b/src/Rest/Helpers.elm
@@ -1,4 +1,4 @@
-module Rest.Helpers exposing (openstackCredentialedRequest)
+module Rest.Helpers exposing (openstackCredentialedRequest, proxyifyRequest)
 
 import Helpers.Helpers as Helpers
 import Http
@@ -6,6 +6,7 @@ import OpenStack.Types as OSTypes
 import Task
 import Time
 import Types.Types as TT
+import Url
 
 
 httpRequestMethodStr : TT.HttpRequestMethod -> String
@@ -31,12 +32,16 @@ openstackCredentialedRequest project method url requestBody expect =
 
     -}
     let
+        ( proxyUrl, headers ) =
+            -- TODO don't hard-code proxy server URL, specify it in global defaults or something
+            proxyifyRequest "https://dogfood.exosphere.app/proxy" url
+
         tokenToRequestCmd : OSTypes.AuthTokenString -> Cmd TT.Msg
         tokenToRequestCmd token =
             Http.request
                 { method = httpRequestMethodStr method
-                , headers = [ Http.header "X-Auth-Token" token ]
-                , url = url
+                , headers = [ Http.header "X-Auth-Token" token ] ++ headers
+                , url = proxyUrl
                 , body = requestBody
                 , expect = expect
                 , timeout = Nothing
@@ -46,3 +51,45 @@ openstackCredentialedRequest project method url requestBody expect =
     Task.perform
         (\posixTime -> TT.ProjectMsg (Helpers.getProjectId project) (TT.ValidateTokenForCredentialedRequest tokenToRequestCmd posixTime))
         Time.now
+
+
+proxyifyRequest : String -> String -> ( String, List Http.Header )
+proxyifyRequest proxyServerUrl requestUrlStr =
+    {- Returns URL to pass to proxy server, and a list of HTTP headers -}
+    let
+        {- Todo should we pass Url.Url around the app instead of URLs as strings? The following string-to-URL conversion is ugly -}
+        defaultUrl =
+            Url.Url
+                Url.Https
+                "thisisbroken.pizza"
+                Nothing
+                ""
+                Nothing
+                Nothing
+
+        requestUrl =
+            Url.fromString requestUrlStr
+                |> Maybe.withDefault defaultUrl
+
+        origHost =
+            requestUrl.host
+
+        origPort =
+            requestUrl.port_ |> Maybe.withDefault 443
+
+        pathQuery =
+            case requestUrl.query of
+                Just query ->
+                    requestUrl.path ++ "?" ++ query
+
+                Nothing ->
+                    requestUrl.path
+
+        proxyRequestUrl =
+            proxyServerUrl ++ pathQuery
+    in
+    ( proxyRequestUrl
+    , [ Http.header "exo-proxy-orig-host" origHost
+      , Http.header "exo-proxy-orig-port" <| String.fromInt origPort
+      ]
+    )
diff --git a/src/Rest/Rest.elm b/src/Rest/Rest.elm
index 8de706a7..7fc367db 100644
--- a/src/Rest/Rest.elm
+++ b/src/Rest/Rest.elm
@@ -128,18 +128,24 @@ requestAuthToken creds =
                         ]
                   )
                 ]
-    in
-    {- https://stackoverflow.com/questions/44368340/get-request-headers-from-http-request -}
-    Http.request
-        { method = "POST"
-        , headers = []
-        , url =
+
+        authUrl =
             if String.contains "/auth/tokens" creds.authUrl then
                 -- We previously expected users to provide "/auth/tokens" to be in the Keystone Auth URL; this case statement avoids breaking the app for users who still have that
                 creds.authUrl
 
             else
                 creds.authUrl ++ "/auth/tokens"
+
+        ( proxyUrl, headers ) =
+            -- TODO don't hard-code proxy server URL, specify it in global defaults or something
+            proxyifyRequest "https://dogfood.exosphere.app/proxy" authUrl
+    in
+    {- https://stackoverflow.com/questions/44368340/get-request-headers-from-http-request -}
+    Http.request
+        { method = "POST"
+        , headers = headers
+        , url = proxyUrl
         , body = Http.jsonBody requestBody
 
         {- Todo handle no response? -}