/**
* Returns a key value Map from a JSON node. This is used in custom asset configuration, such as
* meta tags.
*
* @param node The node to extract key value pairs from.
* @return A Map containing the key value attribute pairs.
*/
private Map<String, String> getAttributes(JsonNode node) {
Map<String, String> attrMap = new LinkedHashMap<String, String>();
for (String fieldname : JSON.getFieldnames(node)) {
String value = JSON.getString(node, fieldname);
if (StringUtils.isNotBlank(value)) {
attrMap.put(fieldname, value);
}
}
return attrMap;
}
/**
* Parse a web asset config json file into a WebAssetConfig object.
*
* @param configFile The config file path.
* @return The parsed WebAssetConfig or null if no config to parse.
* @throws IOException If the config file doen't exist or isn't readable or if the config file
* doesn't have any data.
* @throws IllegalArgumentException If the config doesn't contain any ids and isn't a global
* config.
*/
public WebAssetConfig parseConfig(File configFile) throws IOException {
// ignore if the config file doesn't exist
String configPath = configFile.getPath();
if (!configFile.exists() || !configFile.canRead()) {
throw new IOException("Web asset config doesn't exist or not readable: " + configPath);
}
// parse the web asset config file, if error return null
LOG.debug("Started parsing {}", configPath);
JsonNode asset = null;
try {
ObjectMapper mapper = new ObjectMapper();
asset = mapper.readValue(configFile, JsonNode.class);
} catch (Exception e) {
throw new IOException("Cannot parse web asset config:" + configPath);
}
// some config files could parse to null
if (asset == null) {
throw new IOException("Web asset config file doesn't have data: " + configPath);
}
WebAssetConfig webAssetConfig = new WebAssetConfig();
webAssetConfig.setGlobalConfig(JSON.getBoolean(asset, "global", false));
// get the ids for the config, global configs don't have ids but they do
// have aliases
if (webAssetConfig.isGlobalConfig()) {
Map<String, String> aliases = getAttributes(asset.get("aliases"));
if (aliases != null && aliases.size() > 0) {
webAssetConfig.getAliases().putAll(aliases);
}
} else {
List<String> ids = null;
if (asset.has("ids")) {
JsonNode idNode = asset.get("ids");
ids = JSON.getStrings(idNode);
}
if (ids == null || ids.size() == 0) {
throw new IllegalArgumentException(
"Web asset config must " + "have one or more ids: " + configPath);
}
webAssetConfig.getIds().addAll(ids);
}
// add the title
String title = JSON.getString(asset, "title");
if (StringUtils.isNotBlank(title)) {
webAssetConfig.setTitle(title);
}
// loop through the meta tag configurations
if (asset.has("meta")) {
List<Map<String, String>> metas = webAssetConfig.getMetas();
for (JsonNode meta : asset.get("meta")) {
Map<String, String> attributes = getAttributes(meta);
if (attributes.size() > 0) {
metas.add(attributes);
}
}
}
// loop through the script tag configurations
if (asset.has("scripts")) {
List<Map<String, String>> scripts = webAssetConfig.getScripts();
for (JsonNode script : asset.get("scripts")) {
Map<String, String> attributes = null;
if (script instanceof TextNode) {
attributes = new LinkedHashMap<String, String>();
attributes.put("type", "text/javascript");
attributes.put("path", script.asText());
} else {
attributes = getAttributes(script);
}
if (attributes.size() > 0) {
scripts.add(attributes);
}
}
}
// loop through the link tag configurations
if (asset.has("links")) {
List<Map<String, String>> links = webAssetConfig.getLinks();
for (JsonNode link : asset.get("links")) {
Map<String, String> attributes = null;
if (link instanceof TextNode) {
attributes = new LinkedHashMap<String, String>();
attributes.put("rel", "stylesheet");
attributes.put("type", "text/css");
attributes.put("path", link.asText());
} else {
attributes = getAttributes(link);
}
if (attributes.size() > 0) {
links.add(attributes);
}
}
}
LOG.debug("Finished parsing {}", configPath);
return webAssetConfig;
}