Add support for custom embedding URL in Playground (#391)

# PR Checklist
- [x] Did you check if it works normally in all models? *ignore this
when it dosen't uses models*
- [ ] Did you check if it works normally in all of web, local and node
hosted versions? if it dosen't, did you blocked it in those versions?
- [ ] Did you added a type def?

# Description

Add support Openai-compatible custom embedding server on the playground.

Openai-compatible embedding servers:
https://github.com/toshsan/embedding-server
https://github.com/limcheekin/open-text-embeddings
https://github.com/michaelfeil/infinity

I only tested it with infinity. 
there is also a feature that If url does not end in /embeddings,
automatically adds /embeddings.
I think I need to test it with more local embedding servers, but I think
it'll be okay since it's only Playground

src/lib/Playground/PlaygroundEmbedding.svelte

@@ -8,6 +8,7 @@
 
     let query = "";
     let model = "MiniLM";
+    let customEmbeddingUrl = "";
     let data:string[] = [];
     let dataresult:[string, number][] = [];
     let running = false;
@@ -15,7 +16,7 @@
     const run = async () => {
         if(running) return;
         running = true;
-        const processer = new HypaProcesser(model as any);
+        const processer = new HypaProcesser(model as any, customEmbeddingUrl);
         await processer.addText(data);
         console.log(processer.vectors)
         dataresult = await processer.similaritySearchScored(query);
@@ -29,8 +30,14 @@
 <SelectInput bind:value={model}>
     <OptionInput value="MiniLM">MiniLM L6 v2</OptionInput>
     <OptionInput value="nomic">Nomic Embed Text v1.5</OptionInput>
+    <OptionInput value="custom">Custom (OpenAI-compatible)</OptionInput>
 </SelectInput>
 
+{#if model === "custom"}
+    <span class="text-textcolor text-lg">Custom Server URL</span>
+    <TextInput bind:value={customEmbeddingUrl} size="lg" fullwidth />
+{/if}
+
 <span class="text-textcolor text-lg">Query</span>
 <TextInput bind:value={query} size="lg" fullwidth />
 

src/ts/process/memory/hypamemory.ts

@@ -1,20 +1,24 @@
 import localforage from "localforage";
 import { globalFetch } from "src/ts/storage/globalApi";
 import { runEmbedding } from "../transformers";
+import { alertError } from "src/ts/alert";
+import { appendLastPath } from "src/ts/util";
 
 
 export class HypaProcesser{
     oaikey:string
     vectors:memoryVector[]
     forage:LocalForage
-    model:'ada'|'MiniLM'|'nomic'
+    model:'ada'|'MiniLM'|'nomic'|'custom'
+    customEmbeddingUrl:string
 
-    constructor(model:'ada'|'MiniLM'|'nomic'){
+    constructor(model:'ada'|'MiniLM'|'nomic'|'custom',customEmbeddingUrl?:string){
         this.forage = localforage.createInstance({
             name: "hypaVector"
         })
         this.vectors = []
         this.model = model
+        this.customEmbeddingUrl = customEmbeddingUrl
     }
 
     async embedDocuments(texts: string[]): Promise<VectorArray[]> {
@@ -40,15 +44,32 @@ export class HypaProcesser{
             let results:Float32Array[] = await runEmbedding(inputs, this.model === 'nomic' ? 'nomic-ai/nomic-embed-text-v1.5' : 'Xenova/all-MiniLM-L6-v2')
             return results
         }
-        const gf = await globalFetch("https://api.openai.com/v1/embeddings", {
-            headers: {
-            "Authorization": "Bearer " + this.oaikey
-            },
-            body: {
-            "input": input,
-            "model": "text-embedding-ada-002"
+        let gf = null;
+        if(this.model === 'custom'){
+            if(!this.customEmbeddingUrl){
+                alertError('Custom model requires a Custom Server URL')
+                return [0]
             }
-        })
+            const {customEmbeddingUrl} = this
+            const replaceUrl = customEmbeddingUrl.endsWith('/embeddings')?customEmbeddingUrl:appendLastPath(customEmbeddingUrl,'embeddings')
+            
+            gf = await globalFetch(replaceUrl.toString(), {
+                body:{
+                    "input": input
+                },
+            })
+        }
+        if(this.model === 'ada'){
+            gf = await globalFetch("https://api.openai.com/v1/embeddings", {
+                headers: {
+                "Authorization": "Bearer " + this.oaikey
+                },
+                body: {
+                "input": input,
+                "model": "text-embedding-ada-002"
+                }
+            })
+        }
         const data = gf.data
     
     

src/ts/util.ts

@@ -492,4 +492,34 @@ export function trimUntilPunctuation(s:string){
         result = result.slice(0, -1)
     }
     return result
+}
+
+/**
+ * Appends the given last path to the provided URL.
+ *
+ * @param {string} url - The base URL to which the last path will be appended.
+ * @param {string} lastPath - The path to be appended to the URL.
+ * @returns {string} The modified URL with the last path appended.
+ * 
+ * @example
+ * appendLastPath("https://github.com/kwaroran/RisuAI","/commits/main")
+ * return 'https://github.com/kwaroran/RisuAI/commits/main'
+ * 
+ * @example
+ * appendLastPath("https://github.com/kwaroran/RisuAI/","/commits/main")
+ * return 'https://github.com/kwaroran/RisuAI/commits/main
+ * 
+ * @example
+ * appendLastPath("http://127.0.0.1:7997","embeddings")
+ * return 'http://127.0.0.1:7997/embeddings'
+ */
+export function appendLastPath(url, lastPath) {
+    // Remove trailing slash from url if exists
+    url = url.replace(/\/$/, '');
+    
+    // Remove leading slash from lastPath if exists
+    lastPath = lastPath.replace(/^\//, '');
+
+    // Concat the url and lastPath
+    return url + '/' + lastPath;
 }