Merge pull request #9 from wellsync/feat/js-client

feat: include initial js client

public/client.js

@@ -0,0 +1,161 @@
+(function (global) {
+  async function loadScriptAsync(src) {
+    return new Promise((resolve, reject) => {
+      const script = document.createElement("script");
+      script.src = src;
+      script.type = "text/javascript";
+      script.async = true;
+
+      // Resolve the promise when the script is loaded
+      script.onload = () => {
+        console.log(`Script loaded: ${src}`);
+        resolve();
+      };
+
+      // Reject the promise if there's an error loading the script
+      script.onerror = () => {
+        console.error(`Failed to load script: ${src}`);
+        reject(new Error(`Failed to load script: ${src}`));
+      };
+
+      // Append the script to the document head
+      document.head.appendChild(script);
+    });
+  }
+
+  class PharmacyOrder {
+    _privateKey;
+    _iframe;
+
+    constructor(elementSelector, session, options) {
+      const widget = new URL("https://pharmacy.js.wellsync.io");
+
+      widget.searchParams.append("session", session);
+      widget.searchParams.append("clinic", options.clinic);
+      widget.searchParams.append("clinician", options.clinician);
+      widget.searchParams.append("patient", options.patient);
+
+      if (options.drug) {
+        widget.searchParams.append("drug", options.drug);
+      }
+
+      this._iframe = document.createElement("iframe");
+      this._iframe.frameBorder = 0;
+      this._iframe.width = "100%";
+      this._iframe.src = widget.href;
+
+      window.addEventListener("message", this.handleMessage.bind(this), false);
+
+      this._init(elementSelector, options);
+    }
+
+    async _init(elementSelector, options) {
+      await loadScriptAsync(
+        "https://cdn.jsdelivr.net/npm/@iframe-resizer/parent@5.3.2"
+      );
+
+      this._privateKey = await this._importPrivateKey(options.privateKey);
+
+      let target = document.querySelector(elementSelector);
+      if (!target) {
+        throw new Error(
+          "Element not found to mount the pharmacy order widget."
+        );
+      }
+
+      target.appendChild(this._iframe);
+      iframeResize({ license: "GPLv3", waitForLoad: true }, this._iframe);
+    }
+
+    async _importPrivateKey(pemKey) {
+      const pemContents = pemKey
+        .replace(/-----BEGIN PRIVATE KEY-----/, "")
+        .replace(/-----END PRIVATE KEY-----/, "")
+        .replace(/\n/g, "")
+        .replace(/\r/g, "");
+
+      const binaryKey = atob(pemContents);
+      const binaryKeyBuffer = new Uint8Array(binaryKey.length);
+      for (let i = 0; i < binaryKey.length; i++) {
+        binaryKeyBuffer[i] = binaryKey.charCodeAt(i);
+      }
+
+      return await crypto.subtle.importKey(
+        "pkcs8",
+        binaryKeyBuffer.buffer,
+        {
+          name: "RSASSA-PKCS1-v1_5",
+          hash: { name: "SHA-256" },
+        },
+        true,
+        ["sign"]
+      );
+    }
+
+    async handleMessage(event) {
+      if (!this._privateKey) {
+        console.error("Private key not initialized.");
+        return;
+      }
+
+      const { type, data, requestId } = event.data;
+
+      if (type === "SIGN_REQUEST" && data) {
+        try {
+          const signedResponse = await this.sign(data);
+          console.log(signedResponse);
+          event.source.postMessage(
+            {
+              type: "SIGN_RESPONSE",
+              data: signedResponse,
+              requestId,
+            },
+            event.origin
+          );
+        } catch (error) {
+          console.error("Error signing data:", error);
+          event.source.postMessage(
+            {
+              type: "SIGN_ERROR",
+              error: error.message,
+              requestId,
+            },
+            event.origin
+          );
+        }
+      }
+    }
+
+    async sign(data) {
+      if (!this._privateKey) {
+        throw new Error("Private key not initialized.");
+      }
+
+      const encoder = new TextEncoder();
+      const signature = await crypto.subtle.sign(
+        {
+          name: "RSASSA-PKCS1-v1_5",
+        },
+        this._privateKey,
+        encoder.encode(data)
+      );
+
+      return {
+        signature: btoa(String.fromCharCode(...new Uint8Array(signature))),
+        fingerprint: await this.hash(data),
+      };
+    }
+
+    async hash(string) {
+      const utf8 = new TextEncoder().encode(string);
+      const hashBuffer = await crypto.subtle.digest("SHA-256", utf8);
+      const hashArray = Array.from(new Uint8Array(hashBuffer));
+      const hashHex = hashArray
+        .map((bytes) => bytes.toString(16).padStart(2, "0"))
+        .join("");
+      return hashHex;
+    }
+  }
+  // Attach the class to the global object (e.g., `window` in browsers)
+  global.PharmacyOrder = PharmacyOrder;
+})(window);