antville/helma
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Added support for an application checksum which is automatically included in

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dependency checksums/fingerprints/ETags generated via res.dependsOn() and
res.digest().
This commit is contained in:
hns 2002-10-29 17:33:35 +00:00
parent 78309c02aa
commit 35d0389d8e
1 changed files with 31 additions and 21 deletions
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52
src/helma/framework/ResponseTrans.java
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@ -96,7 +96,12 @@ public final class ResponseTrans implements Externalizable {
// the request trans for this response // the request trans for this response
private transient RequestTrans reqtrans; private transient RequestTrans reqtrans;
// the message digest used to generate composed digests for ETag headers
private transient MessageDigest digest; private transient MessageDigest digest;
// the appliciation checksum to make ETag headers sensitive to app changes
long applicationChecksum;
public ResponseTrans () { public ResponseTrans () {
super (); super ();
@ -321,7 +326,7 @@ public final class ResponseTrans implements Externalizable {
// if charset is not set, use western encoding // if charset is not set, use western encoding
if (charset == null) if (charset == null)
charset = "ISO-8859-1"; charset = "ISO-8859-1";
boolean error = false; boolean encodingError = false;
if (response == null) { if (response == null) {
if (buffer != null) { if (buffer != null) {
if (debugBuffer != null) if (debugBuffer != null)
@ -329,18 +334,22 @@ public final class ResponseTrans implements Externalizable {
try { try {
response = buffer.toString ().getBytes (charset); response = buffer.toString ().getBytes (charset);
} catch (UnsupportedEncodingException uee) { } catch (UnsupportedEncodingException uee) {
error = true; encodingError = true;
response = buffer.toString ().getBytes (); response = buffer.toString ().getBytes ();
} }
// if etag is not set, calc MD5 digest and check it // if etag is not set, calc MD5 digest and check it
if (etag == null && !notModified && redir == null) try { if (etag == null && lastModified == -1 &&
String digest = MD5Encoder.encode (response); redir == null && error == null) try {
etag = "\""+digest+"\""; digest = MessageDigest.getInstance("MD5");
byte[] b = digest.digest(response);
etag = "\""+new String (Base64.encode(b))+"\"";
if (reqtrans != null && reqtrans.hasETag (etag)) { if (reqtrans != null && reqtrans.hasETag (etag)) {
response = new byte[0]; response = new byte[0];
notModified = true; notModified = true;
} }
} catch (Exception ignore) {} } catch (Exception ignore) {
// Etag creation failed for some reason. Ignore.
}
buffer = null; // make sure this is done only once, even with more requsts attached buffer = null; // make sure this is done only once, even with more requsts attached
} else { } else {
response = new byte[0]; response = new byte[0];
@ -348,7 +357,7 @@ public final class ResponseTrans implements Externalizable {
} }
notifyAll (); notifyAll ();
// if there was a problem with the encoding, let the app know // if there was a problem with the encoding, let the app know
if (error) if (encodingError)
throw new UnsupportedEncodingException (charset); throw new UnsupportedEncodingException (charset);
} }
@ -393,12 +402,6 @@ public final class ResponseTrans implements Externalizable {
return lastModified; return lastModified;
} }
/* public void setNotModified (boolean notmod) throws RedirectException {
notModified = notmod;
if (notmod)
throw new RedirectException (null);
} */
public void setETag (String value) { public void setETag (String value) {
etag = value == null ? null : "\""+value+"\""; etag = value == null ? null : "\""+value+"\"";
if (etag != null && reqtrans != null && reqtrans.hasETag (etag)) { if (etag != null && reqtrans != null && reqtrans.hasETag (etag)) {
@ -423,6 +426,8 @@ public final class ResponseTrans implements Externalizable {
} }
if (what == null) { if (what == null) {
digest.update (new byte[0]); digest.update (new byte[0]);
} else if (what instanceof Date) {
digest.update (MD5Encoder.toBytes((Date) what).getTime());
} else if (what instanceof byte[]) { } else if (what instanceof byte[]) {
digest.update ((byte[]) what); digest.update ((byte[]) what);
} else { } else {
@ -435,18 +440,23 @@ public final class ResponseTrans implements Externalizable {
} }
public void digestDependencies () { public void digestDependencies () {
if (digest == null) if (digest == null)
return; return;
byte[] b = digest.digest(); byte[] b = digest.digest(MD5Encoder.toBytes (applicationChecksum));
/* StringBuffer buf = new StringBuffer(b.length*2); /* StringBuffer buf = new StringBuffer(b.length*2);
for ( int i=0; i<b.length; i++ ) { for ( int i=0; i<b.length; i++ ) {
int j = (b[i]<0) ? 256+b[i] : b[i]; int j = (b[i]<0) ? 256+b[i] : b[i];
if ( j<16 ) buf.append("0"); if ( j<16 ) buf.append("0");
buf.append(Integer.toHexString(j)); buf.append(Integer.toHexString(j));
} */ }
setETag (buf.toString ()); */
setETag (new String (Base64.encode(b))); setETag (new String (Base64.encode(b)));
} }
public void setApplicationChecksum (long n) {
applicationChecksum = n;
}
public void setSkinpath (Object[] arr) { public void setSkinpath (Object[] arr) {
this.skinpath = arr; this.skinpath = arr;
skincache = null; skincache = null;