feat(deps): Remove dependency to sap cloud sdk

package.json

@@ -1,6 +1,6 @@
 {
     "name": "cds-routing-handlers",
-    "version": "3.0.6",
+    "version": "3.0.7",
     "description": "Package to route and implement CDS handlers via a class based approach in Typescript.",
     "main": "lib/index.js",
     "repository": "https://github.com/mrbandler/cds-routing-handlers",
@@ -56,7 +56,6 @@
         "typescript": "^4.5.4"
     },
     "dependencies": {
-        "@sap-cloud-sdk/core": "^1.53.0",
         "glob": "^7.2.0",
         "reflect-metadata": "^0.1.13"
     },

src/metadata/base/CloudSdkReplacement.ts

@@ -0,0 +1,40 @@
+import { IncomingMessage } from "http";
+
+export function retrieveJwt(req: IncomingMessage): string | undefined {
+    const header = authHeader(req);
+    if (validateAuthHeader(header)) {
+        return header!.split(" ")[1];
+    }
+}
+
+function authHeader(req: IncomingMessage): string | undefined {
+    const entries = Object.entries(req.headers).find(([key]) => key.toLowerCase() === "authorization");
+    if (entries) {
+        const header = entries[1];
+
+        // Header could be a list of headers
+        return Array.isArray(header) ? header[0] : header;
+    }
+    return undefined;
+}
+
+function validateAuthHeader(header: string | undefined): boolean {
+    if (typeof header === "undefined") {
+        console.warn("Authorization header not set.");
+        return false;
+    }
+
+    const [authType, token] = header.split(" ");
+
+    if (typeof token === "undefined") {
+        console.warn("Token in auth header missing.");
+        return false;
+    }
+
+    if (authType.toLowerCase() !== "bearer") {
+        console.warn("Authorization type is not Bearer.");
+        return false;
+    }
+
+    return true;
+}

src/metadata/base/Executer.ts

@@ -2,6 +2,7 @@ import { ParamMetadata } from "../ParamMetadata";
 import { IExecContext } from "../../types/IExecContext";
 import { ParamType } from "../../types/ParamType";
 import { UserCheckerMetadata } from "../UserCheckerMetadata";
+import { retrieveJwt } from "./CloudSdkReplacement";
 
 /**
  * Abstract executer class.
@@ -13,14 +14,6 @@ import { UserCheckerMetadata } from "../UserCheckerMetadata";
  * @class Executer
  */
 export abstract class Executor {
-    /**
-     * Cloud core functions.
-     *
-     * @private
-     * @memberof Executor
-     */
-    private cloud = require("@sap-cloud-sdk/core");
-
     /**
      * Abstract exec method, to be implemented in the child class.
      *
@@ -49,7 +42,7 @@ export abstract class Executor {
             return 0;
         });
 
-        return sortedParams.map(param => {
+        return sortedParams.map((param) => {
             switch (param.type) {
                 case ParamType.Srv:
                     return context.srv;
@@ -85,15 +78,14 @@ export abstract class Executor {
      */
     private extractJwt(context: any): string | undefined {
         let token;
-        // https://help.sap.com/doc/88b0d45562c04571a8d117bc8b6b3b7a/1.0/en-US/modules/_sap_cloud_sdk_core.html#retrievejwt
-        // cloud needs the incoming message
+
         try {
-            token = this.cloud.retrieveJwt(context.req._.req);
+            token = retrieveJwt(context.req._.req);
         } catch (error) {
             // silence
         }
         try {
-            if (!token) token = this.cloud.retrieveJwt(context.req);
+            if (!token) token = retrieveJwt(context.req);
         } catch (error) {
             // silence
         }

yarn.lock

@@ -260,7 +260,7 @@
     "@sap-cloud-sdk/util" "^1.53.0"
     axios "^0.21.1"
 
-"@sap-cloud-sdk/core@^1.41", "@sap-cloud-sdk/core@^1.53.0":
+"@sap-cloud-sdk/core@^1.41":
   version "1.53.0"
   resolved "https://registry.yarnpkg.com/@sap-cloud-sdk/core/-/core-1.53.0.tgz#6882d58260fa0c72d068ecb7083418b16920c2cd"
   integrity sha512-xCiEYiGi7PAQNfzmYmOWRw6oBjIzmiv6Yag8haTRPqLo2Aox6pqEfhbKunzqi6wJPUSgJByW696nzx5CY6BCjQ==