Remote Image Processing (#1684)

* Update ServerConfig.kt

* Update ConversionUtil.kt

* Update Page.kt

* Update ServerConfig.kt

fixed deletions caused by ide

* Update ServerConfig.kt

* Update ServerConfig.kt

* Cleanup

* Post-processing terminology

* More comments

* Lint

* Add known image mimes

* Fix weird mime set/get

* Implement different downloadConversions and serveConversions

* Lint

* Improve Post-Processing massivly

* Fix thumbnail build

* Use Array for headers

* Actually fix headers

* Actually fix headers 2

* Manually parse DownloadConversion

* Cleanup parse

* Fix write

* Update TypeName

* Optimize imports

* Remove header type

* Fix build

---------

Co-authored-by: Syer10 <syer10@users.noreply.github.com>

docs/Configuring-Suwayomi‐Server.md

@@ -23,7 +23,7 @@ The configuration file is written in HOCON. Google is your friend if you want to
 server.ip = "0.0.0.0"
 server.port = 4567
 ```
-- `server.ip` can be a IP or domain name.
+- `server.ip` can be an IP or domain name.
 
 ### Socks5 proxy
 ```
@@ -78,8 +78,8 @@ server.downloadConversions = {}
 - `server.excludeEntryWithUnreadChapters = true` controls if Suwayomi will download new chapters for titles with unread chapters (requires `server.autoDownloadNewChapters`).
 - `server.autoDownloadNewChaptersLimit = 0` sets how many chapters should be downloaded at most, `0` to disable the limit; if the limit is reached, new chapters will not be downloaded (requires `server.autoDownloadNewChapters`).
 - `server.autoDownloadIgnoreReUploads = false` controls if Suwayomi will re-download re-uploads on update (requires `server.autoDownloadNewChapters`).
-- `server.downloadConversions = {}` configures optional image conversions for all downloads. This is an [JSON object](https://en.wikipedia.org/wiki/JSON#Syntax), with the source image [mime type](https://en.wikipedia.org/wiki/Media_type) as the key and an object with the target mime type and options as value.  
-  The following options are both valid:  
+- `server.downloadConversions = {}` configures optional image conversions for all downloads. This is an [JSON object](https://en.wikipedia.org/wiki/JSON#Syntax), with the source image [mime type](https://en.wikipedia.org/wiki/Media_type) as the key and an object with the target mime type or url and options as value.  
+  The following options are all valid:  
   ```
   server.downloadConversions = { "image/webp" : { target : "image/jpeg", compressionLevel = 0.8 }}
   # -- or --
@@ -87,8 +87,25 @@ server.downloadConversions = {}
     target = "image/jpeg"   # image type to convert to
     compressionLevel = 0.8  # quality in range [0,1], leave away to use default compression
   }
+  # -- a url example --
+  server.downloadConversions = { "default" : { target : "http://localhost:9999/convert" }}
+  # -- a url with all parameters example --
+  server.downloadConversions = { 
+      "default" : {
+          target : "http://localhost:9999/convert",
+          callTimeout : 10m,
+          connectTimeout : 10s,
+          headers : { 
+              "authorization" : "MyPassword"
+          }
+      }
+  }
   ```  
   A source mime type `default` can be used as fallback to convert all images; a target mime type of `none` can be used to disable conversion for a particular format.
+  
+  This is an example curl command for what Suwayomi-Server will send to the conversion url: `curl -X POST "http://localhost:9999/convert" -F "image=@cat.png;type=image/png"`
+- `server.serveConversions = {}` configures optional image conversions before serving the image to the client. It follows the same format as `server.downloadConversions`.
+
 
 ### Updater
 ```

docs/Getting-Extensions.md

@@ -1,5 +1,5 @@
 1. **Install the latest version(or preview):** https://github.com/Suwayomi/Suwayomi-Server/releases/latest
-2. Find an extensions repo, there is now no default extensions and you have to use google to find a Tachiyomi extension repo.
+2. Find an extensions repo, there is now no default extensions, and you have to use Google to find a Tachiyomi extension repo.
    - Note: The repo should look like `https://raw.githubusercontent.com/user/reponame` or `https://www.github.com/user/reponame`
 3. Configure it using one of the following:
    - Suwayomi-Server option 1: With the **new launcher**, go to the `Extensions` tab and add the extensions repo.

docs/Local-Source.md

@@ -5,7 +5,7 @@ Follow the steps below to create local manga.
 
 If you add more chapters then you'll have to manually refresh the chapter list.
 
-Supported chapter formats are folder with pictures inside (such as `.jpg`, `.png`, etc), `ZIP`/`CBZ`, `RAR`/`CBR` and `EPUB`. But expect better performance with directories and `ZIP`/`CBZ`.
+Supported chapter formats are folder with pictures inside (such as `.jpg`, `.png`, etc.), `ZIP`/`CBZ`, `RAR`/`CBR` and `EPUB`. But expect better performance with directories and `ZIP`/`CBZ`.
 
 **Note:** While Suwayomi does support chapters compressed as **RAR** or **CBR**, note that **RAR** or **CBR** files using the **RAR5** format are not supported yet.
 
@@ -111,7 +111,7 @@ Archive files such as `ZIP`/`CBZ` are supported but the folder structure inside
 
 It is possible to add details to local manga. Like manga from other catalogs, you add information about the manga such as the author, artist, description, and genre tags.
 
-To import details along with your local manga, you have to create a json file. It can be named anything but it must be placed within the **Manga** folder. A standard file name is `details.json`. This file will contain the extended details about the manga in the `JSON` format. You can see the example below on how to build the file. Once the file is there, the app should load the data when you first open the manga or you can pull down to refresh the details.
+To import details along with your local manga, you have to create a json file. It can be named anything but it must be placed within the **Manga** folder. A standard file name is `details.json`. This file will contain the extended details about the manga in the `JSON` format. You can see the example below on how to build the file. Once the file is there, the app should load the data when you first open the manga, or you can pull down to refresh the details.
 
 You can copy the following example and edit the details as needed:
 ``` json

docs/Troubleshooting.md

@@ -1,5 +1,5 @@
 ## General Troubleshooting
-This guide will try to fix Suwayomi by reseting it to a clean install state.
+This guide will try to fix Suwayomi by reseting it to a clean installation state.
 
 - Make sure you have a recent backup of your library or create one in the app (if possible) because we **are going to wipe all Suwayomi data**.
 - Make sure Suwayomi is not running (right click on tray icon and quit or kill it through the way your Operating System provides)