From e727bce18885a924f069e6f0845f4987560d6410 Mon Sep 17 00:00:00 2001
From: Peter Cai <peter@typeblog.net>
Date: Mon, 13 Apr 2020 16:50:36 +0800
Subject: [PATCH] add support for hard-coded redirects in config.json

---
 README.md    |  6 ++++++
 src/lib.rs   | 19 +++++++++++++++++--
 src/utils.rs |  7 ++++++-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index c5f4ba9..804b0be 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,10 @@ This is the main configuration file. The file will be compiled statically into t
   "description": "<description>",
   "plugin_identifier": "com.example.change.this.to.whatever.you.like",
   "posts_per_page": 5,
+  "redirects": {
+    "/foo": "/bar",
+    ...
+  },
   "hljs": [
     "rust",
     "javascript",
@@ -81,6 +85,8 @@ This is the main configuration file. The file will be compiled statically into t
 
 `plugin_identifier`: Used in Standard Notes to distinguish plugins.
 
+`redirects`: OPTIONAL. A map of URLs where the key will be mapped to the value by Paprika using 301 redirects. This is mainly useful for migration from another blogging platform.
+
 `hljs`: An array of language support from `highlight.js` to be included in the final binary. The full `highlight.js` is notoriously huge and there's really no reason to include a bazillion languages you will never actually use in your blog posts. This will be read by `build.rs` to generate a JS shim that will load all languages in the array to the final binary via `webpack` support for `require`.
 
 Configuration: theme_config.json
diff --git a/src/lib.rs b/src/lib.rs
index 20f6858..6f18c62 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -104,9 +104,24 @@ async fn proxy_remote_image(req: Request, url: Url) -> MyResult<Response> {
 
 async fn default_route(_req: Request, url: Url) -> MyResult<Response> {
     // We assume that anything that falls into this catch-all handler
-    // would be either posts or 404
-    // If the path doesn't end with `/`, normalize it first
+    // would be posts, 404, or hard-codede redirects
     let path = url.pathname();
+
+    // Handle hard-coded redirects in config first
+    if let Some(redirects) = &CONFIG.redirects {
+        if let Some(new_path) = redirects.get(&path) {
+            return Response::new_with_opt_str_and_init(
+                None,
+                ResponseInit::new()
+                    .status(301)
+                    .headers(headers!{
+                        "Location" => &format!("{}{}", url.origin(), new_path)
+                    }.as_ref())
+            ).internal_err();
+        }
+    }
+
+    // If the path doesn't end with `/`, normalize it first
     if !path.ends_with("/") {
         return Response::new_with_opt_str_and_init(
             None,
diff --git a/src/utils.rs b/src/utils.rs
index 141555e..f1a288d 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,6 +1,7 @@
 use cfg_if::cfg_if;
 use serde::Deserialize;
 use js_sys::*;
+use std::collections::HashMap;
 use wasm_bindgen::prelude::*;
 use wasm_bindgen_futures::*;
 use web_sys::*;
@@ -154,7 +155,11 @@ pub struct Config {
     // Plugin identifier used for Standard Notes
     pub plugin_identifier: String,
     // How many posts to show in one page
-    pub posts_per_page: usize
+    pub posts_per_page: usize,
+    // Hard-coded redirects (for migrating old articles and such)
+    // Paths here MUST include the starting "/"
+    // UNLIKE in article headers
+    pub redirects: Option<HashMap<String, String>>
 }
 
 include!(concat!(env!("OUT_DIR"), "/build_timestamp.rs"));
\ No newline at end of file