asset.pipeline.AssetPipelineResponseBuilder.groovy Maven / Gradle / Ivy
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JVM Asset Pipeline library for serving static web assets, bundling, minifying, and extensibility for transpiling.
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package asset.pipeline
import groovy.transform.CompileStatic
import java.util.TimeZone
import java.text.SimpleDateFormat
@CompileStatic
public class AssetPipelineResponseBuilder {
public static final String HTTP_DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss zzz"
public String uri
public String ifNoneMatchHeader
public String ifModifiedSinceHeader
public Integer statusCode = 200
private Date lastModifiedDate
public Map headers = [:]
AssetPipelineResponseBuilder(String uri, String ifNoneMatchHeader = null, String ifModifiedSinceHeader = null, Date lastModifiedDate = null) {
this.uri = uri
this.ifNoneMatchHeader = ifNoneMatchHeader
this.ifModifiedSinceHeader = ifModifiedSinceHeader
this.lastModifiedDate = lastModifiedDate
boolean digestVersion = isDigestVersion()
if(!checkDateChanged()) {
statusCode = 304
} else if (checkETag()) {
headers['Vary'] = 'Accept-Encoding'
if(digestVersion && !uri.endsWith(".html")) {
headers['Cache-Control'] = 'public, max-age=31536000'
} else {
headers['Cache-Control'] = 'no-cache'
}
}
}
public Map getHeaders() {
return headers;
}
public Integer getStatusCode() {
return statusCode;
}
public String getCurrentETag() {
String manifestPath = uri
if (uri.startsWith('/')) {
manifestPath = uri.substring(1) //Omit forward slash
}
Properties manifest = AssetPipelineConfigHolder.manifest
return "\"" + (manifest?.getProperty(manifestPath) ?: manifestPath) + "\""
}
public boolean isDigestVersion() {
String manifestPath = uri
if (uri.startsWith('/')) {
manifestPath = uri.substring(1) //Omit forward slash
}
Properties manifest = AssetPipelineConfigHolder.manifest
return manifest?.getProperty(manifestPath,null) ? false : true
}
public Boolean checkETag() {
String etagName = getCurrentETag()
if (ifNoneMatchHeader && ifNoneMatchHeader == etagName) {
statusCode = 304
return false
}
headers["ETag"] = etagName
return true
}
public Boolean checkDateChanged() {
SimpleDateFormat sdf = new SimpleDateFormat(HTTP_DATE_FORMAT,Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
boolean hasNotChanged = false
if(lastModifiedDate) {
headers["Last-Modified"] = getLastModifiedDate(lastModifiedDate)
}
if (ifModifiedSinceHeader && lastModifiedDate) {
try {
hasNotChanged = lastModifiedDate <= sdf.parse(ifModifiedSinceHeader)
} catch (Exception e) {
//Ignore this just a parse error
}
}
return !hasNotChanged
}
private String getLastModifiedDate(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat(HTTP_DATE_FORMAT,Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
String lastModifiedDateTimeString = sdf.format(new Date())
try {
lastModifiedDateTimeString = sdf.format(date)
} catch (Exception e) {
//Ignore
}
return lastModifiedDateTimeString
}
}
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