[AAE-11695] move version compatibility directive and service (#8038)

* [AAE-11695] move version compatibility directive

* [AAE-11695] remove spare readme section

lib/content-services/src/lib/version-compatibility/version-compatibility.service.ts

@@ -0,0 +1,80 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Injectable } from '@angular/core';
+import { filter } from 'rxjs/operators';
+import { ReplaySubject } from 'rxjs';
+import { VersionInfo, RepositoryInfo } from '@alfresco/js-api';
+import { DiscoveryApiService } from '@alfresco/adf-core';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class VersionCompatibilityService {
+    private acsVersion: VersionInfo;
+
+    acsVersionInitialized$ = new ReplaySubject();
+
+    constructor(private discoveryApiService: DiscoveryApiService) {
+        this.discoveryApiService.ecmProductInfo$
+            .pipe(filter(acsInfo => !!acsInfo))
+            .subscribe((acsInfo: RepositoryInfo) => this.initializeAcsVersion(acsInfo.version));
+    }
+
+    private initializeAcsVersion(acsVersion: VersionInfo) {
+        this.acsVersion = acsVersion;
+        this.acsVersionInitialized$.next();
+    }
+
+    getAcsVersion(): VersionInfo {
+        return this.acsVersion;
+    }
+
+    isVersionSupported(requiredVersion: string): boolean {
+        const parsedRequiredVersion = this.parseVersion(requiredVersion);
+        const currentVersion = this.getAcsVersion();
+
+        let versionSupported = false;
+
+        if (currentVersion) {
+            if (+currentVersion.major > +parsedRequiredVersion.major) {
+                versionSupported = true;
+            } else if (currentVersion.major === parsedRequiredVersion.major &&
+                +currentVersion.minor > +parsedRequiredVersion.minor) {
+                versionSupported = true;
+            } else if (currentVersion.major === parsedRequiredVersion.major &&
+                currentVersion.minor === parsedRequiredVersion.minor &&
+                +currentVersion.patch >= +parsedRequiredVersion.patch) {
+                versionSupported = true;
+            }
+        }
+
+        return versionSupported;
+    }
+
+    private parseVersion(version: string): VersionInfo {
+        const major = version.split('.')[0];
+        const minor = version.split('.')[1] || '0';
+        const patch = version.split('.')[2] || '0';
+
+        return {
+            major,
+            minor,
+            patch
+        } as VersionInfo;
+    }
+}