package com.getcapacitor; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.nio.charset.StandardCharsets; /** * JSInject is responsible for returning Capacitor's core * runtime JS and any plugin JS back into HTML page responses * to the client. */ class JSInjector { private String globalJS; private String bridgeJS; private String pluginJS; private String cordovaJS; private String cordovaPluginsJS; private String cordovaPluginsFileJS; private String localUrlJS; private String miscJS; public JSInjector( String globalJS, String bridgeJS, String pluginJS, String cordovaJS, String cordovaPluginsJS, String cordovaPluginsFileJS, String localUrlJS ) { this(globalJS, bridgeJS, pluginJS, cordovaJS, cordovaPluginsJS, cordovaPluginsFileJS, localUrlJS, null); } public JSInjector( String globalJS, String bridgeJS, String pluginJS, String cordovaJS, String cordovaPluginsJS, String cordovaPluginsFileJS, String localUrlJS, String miscJS ) { this.globalJS = globalJS; this.bridgeJS = bridgeJS; this.pluginJS = pluginJS; this.cordovaJS = cordovaJS; this.cordovaPluginsJS = cordovaPluginsJS; this.cordovaPluginsFileJS = cordovaPluginsFileJS; this.localUrlJS = localUrlJS; this.miscJS = miscJS; } /** * Generates injectable JS content. * This may be used in other forms of injecting that aren't using an InputStream. * @return */ public String getScriptString() { String scriptString = globalJS + "\n\n" + localUrlJS + "\n\n" + bridgeJS + "\n\n" + pluginJS + "\n\n" + cordovaJS + "\n\n" + cordovaPluginsFileJS + "\n\n" + cordovaPluginsJS; if (miscJS != null) { scriptString += "\n\n" + miscJS; } return scriptString; } /** * Given an InputStream from the web server, prepend it with * our JS stream * @param responseStream * @return */ public InputStream getInjectedStream(InputStream responseStream) { String js = ""; String html = this.readAssetStream(responseStream); // Insert the js string at the position after or before using StringBuilder StringBuilder modifiedHtml = new StringBuilder(html); if (html.contains("")) { modifiedHtml.insert(html.indexOf("") + "".length(), "\n" + js + "\n"); html = modifiedHtml.toString(); } else if (html.contains("")) { modifiedHtml.insert(html.indexOf(""), "\n" + js + "\n"); html = modifiedHtml.toString(); } else { Logger.error("Unable to inject Capacitor, Plugins won't work"); } return new ByteArrayInputStream(html.getBytes(StandardCharsets.UTF_8)); } private String readAssetStream(InputStream stream) { try { final int bufferSize = 1024; final char[] buffer = new char[bufferSize]; final StringBuilder out = new StringBuilder(); Reader in = new InputStreamReader(stream, StandardCharsets.UTF_8); for (;;) { int rsz = in.read(buffer, 0, buffer.length); if (rsz < 0) break; out.append(buffer, 0, rsz); } return out.toString(); } catch (Exception e) { Logger.error("Unable to process HTML asset file. This is a fatal error", e); } return ""; } }