Using Knox 0.11 and reproduced with Knox 0.14, we're having trouble
getting basic URL rewriting to work. The real problem is with an
ExpressJS application, and the URL is part of some JavaScript, but I
wanted to get this basic example working first. Please may I ask for
help to spot what I'm doing wrong? The HTML that goes to the browser
is entirely unchanged from the HTML served by the back end
application, while I'd expected the href URLs to be changed on the way
out.
How much parsing does the rules/rewrite filters attempt? How might a
Webpack encoding affect this? (Although this isn't relevant to this
simple HTML example.)
Is there a way to turn up logging (already have
log4j.logger.org.apache.hadoop.gateway=DEBUG) to see what rules and
filters are being applied (or not)?
example.html
<html>
<body>
<a href="/api/v1/user">hello</a>
<a href="/api/v1">hello</a>
</body>
</html>
service.xml
<service role="EXAMPLEUI" name="exampleui" version="0.0.1">
<policies>
<policy role="webappsec"/>
<policy role="authentication" name="Anonymous"/>
<policy role="rewrite"/>
<policy role="authorization"/>
</policies>
<routes>
<route path="/exampleui">
<rewrite apply="EXAMPLEUI/exampleui/inbound/root" to="request.url"/>
<rewrite apply="EXAMPLEUI/exampleui/outbound/html/filter"
to="response.body"/>
</route>
<route path="/exampleui/**">
<rewrite apply="EXAMPLEUI/exampleui/inbound/path" to="request.url"/>
<rewrite apply="EXAMPLEUI/exampleui/outbound/html/filter"
to="response.body"/>
</route>
</routes>
<dispatch
classname="org.apache.hadoop.gateway.dispatch.PassAllHeadersDispatch"/>
</service>
rewrite.xml
<rules>
<rule dir="IN" name="EXAMPLEUI/exampleui/inbound/root"
pattern="*://*:*/**/exampleui/">
<rewrite template="{$serviceUrl[EXAMPLEUI]}/"/>
</rule>
<rule dir="IN" name="EXAMPLEUI/exampleui/inbound/path"
pattern="*://*:*/**/exampleui/{**}">
<rewrite template="{$serviceUrl[EXAMPLEUI]}/{**}"/>
</rule>
<rule dir="OUT" name="EXAMPLEUI/exampleui/outbound/apipath">
<rewrite template="{$frontend[path]}/exampleui/api/v1"/>
</rule>
<filter name="EXAMPLEUI/exampleui/outbound/html/filter">
<content type="text/html">
<apply path="/api/v1" rule="EXAMPLEUI/exampleui/outbound/apipath"/>
</content>
</filter>
</rules>
==> /var/log/hadoop/knox/gateway.log <==
2018-01-17 16:54:46,934 DEBUG hadoop.gateway
(DefaultDispatch.java:executeOutboundRequest(133)) - Dispatch response status:
200
2018-01-17 16:54:46,935 DEBUG hadoop.gateway
(DefaultDispatch.java:getInboundResponseContentType(202)) - Using explicit
character set UTF-8 for entity of type text/html
2018-01-17 16:54:46,935 DEBUG hadoop.gateway
(DefaultDispatch.java:getInboundResponseContentType(210)) - Inbound response
entity content type: text/html; charset=UTF-8
==> /var/log/hadoop/knox/gateway-audit.log <==
18/01/17 16:54:46
||47193300-cc6c-48e6-aad0-e2b04f2db613|audit|EXAMPLEUI||||dispatch|uri|http://server.project:4201/example.html|success|Response
status: 200
==> /var/log/hadoop/knox/gateway.log <==
==> /var/log/hadoop/knox/gateway-audit.log <==
18/01/17 16:54:46
||47193300-cc6c-48e6-aad0-e2b04f2db613|audit|EXAMPLEUI||||access|uri|/gateway/project/exampleui/example.html|success|Response
status: 200
Many thanks for any pointers.
We've read through:
https://github.com/apache/knox/blob/master/gateway-service-definitions/src/main/resources/services/ambariui/2.2.0/rewrite.xml
https://cwiki.apache.org/confluence/display/KNOX/Proxying+a+UI+using+Knox
https://cwiki.apache.org/confluence/display/KNOX/2017/08/14/Understanding+Rewrite+Rules+for+Apache+Knox#UnderstandingRewriteRulesforApacheKnox-JavaScriptURLRewriteFilter
Regards,
Stuart
