fix: return an error if image location was not provided by fxtwitter

flake.lock

@@ -38,6 +38,24 @@
         "type": "github"
       }
     },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1716715802,
@@ -58,7 +76,29 @@
       "inputs": {
         "crane": "crane",
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1717985971,
+        "narHash": "sha256-24h/qKp0aeI+Ew13WdRF521kY24PYa5HOvw0mlrABjk=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "abfe5b3126b1b7e9e4daafc1c6478d17f0b584e7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     },
     "systems": {
@@ -75,6 +115,21 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -9,13 +9,18 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
   
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, crane, flake-utils, ... }:
+  outputs = { self, nixpkgs, crane, flake-utils, rust-overlay, ... }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = nixpkgs.legacyPackages.${system}.appendOverlays [(import rust-overlay)];
         craneLib = crane.mkLib pkgs;
         my-crate = craneLib.buildPackage {
           src = craneLib.cleanCargoSource (craneLib.path ./.);
@@ -39,9 +44,7 @@
 
           packages = with pkgs; [
             cargo
-            rustc
+            (rust-bin.stable.latest.default.override {extensions = ["rust-src"];})
-            rust-analyzer
-            rustfmt
           ];
         };
       });

src/main.rs

@@ -128,12 +128,12 @@ async fn fetch_twitter_image_link(http: &reqwest::Client, url: &Uri) -> AppResul
         .path_and_query(url.path_and_query().unwrap().clone())
         .build()?
         .to_string();
-    let req = http.get(fxurl).build()?;
+    let req = http.get(&fxurl).build()?;
     let resp = http.execute(req).await?.error_for_status()?;
     let link = resp
         .headers()
         .get(http::header::LOCATION)
-        .unwrap()
+        .ok_or_else(|| format!("twitter link {fxurl} did not return an image location"))?
         .to_str()?;
     // use webp format for direct twitter links since webp is cheaper
     Ok(format!("{link}?format=webp"))