[libvirt] [PATCH 0/3] Ditch external JavaScript libraries
This is a response to all the discussions (mainly) other people had about all the JS code we're currently using, bundling, etc. I would love some feedback on whether we can work on any of the solutions for getting rid of that external proxy. We would have to: - either have our own proxy, - send a 'Access-Control-Allow-Origin' header from the libvirt.org server to allow fetching the atom.xml or - be providing JSONP access to the RSS feed on virt-planet. I do not have access to any of the infrastructure, so I cannot say if any of that is possible. It is definitely possible from the technical point of view. Martin Kletzander (3): docs: Use our own implementation for fetching the RSS data docs: use case sensitive javascript docs: Remove unused JS libraries docs/Makefile.am | 6 +---- docs/index.html.in | 16 ------------ docs/js/jquery-3.1.1.min.js | 4 --- docs/js/jquery.rss.min.js | 11 --------- docs/js/main.js | 49 ++++++++++++++++++++++++++++++++++++- docs/js/moment.min.js | 7 ------ 6 files changed, 49 insertions(+), 44 deletions(-) delete mode 100644 docs/js/jquery-3.1.1.min.js delete mode 100644 docs/js/jquery.rss.min.js delete mode 100644 docs/js/moment.min.js -- 2.21.0
This is just a small script I wrote. It works the same way as all the libraries together which we are bundling, but with just JS. The only difference is that the day of the date is formatted as 2-digit, but this should be a bug in Firefox (at least locally for me) as the documentation states that type 'numeric' should actually not have leading zeros. It will not be executed when the page is loaded locally. It also uses the same proxy that query-rss uses. We can get rid of that, but we'd either need to have our own proxy, send a sss header to allow fetching the atom.xml or providing JSONP access to the RSS feed on virt-planet. Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/index.html.in | 13 ------------- docs/js/main.js | 47 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+), 13 deletions(-) diff --git a/docs/index.html.in b/docs/index.html.in index f593445d061d..fa75289cad0f 100644 --- a/docs/index.html.in +++ b/docs/index.html.in @@ -5,19 +5,6 @@ <script type="text/javascript" src="js/jquery-3.1.1.min.js"> </script> <script type="text/javascript" src="js/moment.min.js"> </script> <script type="text/javascript" src="js/jquery.rss.min.js"> </script> - - <script type="text/javascript"> - <!-- - jQuery(function($) { - $("#planet").rss("http://planet.virt-tools.org/atom.xml", { - ssl: true, - layoutTemplate: '<dl>{entries}</dl>', - entryTemplate: '<dt><a href="{url}">{title}</a></dt><dd>by {author} on {date}</li>', - dateFormat: 'DD MMM YYYY' - }) - }) - // --> - </script> </head> <body class="index"> <h1>The virtualization API</h1> diff --git a/docs/js/main.js b/docs/js/main.js index e57b9f47ac11..07f79c7ff903 100644 --- a/docs/js/main.js +++ b/docs/js/main.js @@ -29,6 +29,53 @@ function pageload() { simpleSearch = document.getElementById("simplesearch") simplesearch.addEventListener("submit", advancedsearch) + + docLoc = document.location; + if (docLoc.protocol != "file:" || + docLoc.origin != "null" || + docLoc.host !== "" || + docLoc.hostname !== "") { + fetchRSS() + } +} + +function fetchRSS() { + cb = "jsonpRSSFeedCallback" + window["jsonpRSSFeedCallback"] = function (data) { + if (data.responseStatus != 200) + return + entries = data.responseData.feed.entries + nEntries = Math.min(entries.length, 4) + + dl = document.createElement('dl') + + dateOpts = { day: 'numeric', month: 'short', year: 'numeric'} + + for (i = 0; i < nEntries; i++) { + entry = entries[i] + a = document.createElement('a') + a.href = entry.link + a.innerText = entry.title + + dt = document.createElement('dt') + dt.appendChild(a) + dl.appendChild(dt) + + date = new Date(entry.publishedDate) + datestr = date.toLocaleDateString('default', dateOpts) + + dd = document.createElement('dd') + dd.innerText = ` by ${entry.author} on ${datestr}` + + dl.appendChild(dd) + } + + planet.appendChild(dl); + }; + script = document.createElement("script") + script.src = "https://feedrapp.herokuapp.com/" + script.src += `?q=http%3A%2F%2Fplanet.virt-tools.org%2Fatom.xml&callback=${cb}` + document.body.appendChild(script); } function advancedsearch(e) { -- 2.21.0
On Wed, 2019-06-19 at 17:22 +0200, Martin Kletzander wrote: [...]
+ docLoc = document.location; + if (docLoc.protocol != "file:" || + docLoc.origin != "null" || + docLoc.host !== "" || + docLoc.hostname !== "") { + fetchRSS() + }
This probably doesn't need to be this complicated, just the check against .protocol is probably okay. If we need more flexibility we can just add it later. [...]
+function fetchRSS() { + cb = "jsonpRSSFeedCallback" + window["jsonpRSSFeedCallback"] = function (data) {
You should be reusing cb here :) [...]
+ dateOpts = { day: 'numeric', month: 'short', year: 'numeric'}
You're using both single and double quotes... Please stick with a single style, more specifically the latter which is already used consistently throughout the file. [...]
+ script.src = "https://feedrapp.herokuapp.com/" + script.src += `?q=http%3A%2F%2Fplanet.virt-tools.org%2Fatom.xml&callback=${cb}`
You didn't turn this into a clear URL :) That's alright, if it can be done at all you might very well fix it up later. With the above addressed, Reviewed-by: Andrea Bolognani <abologna@redhat.com> -- Andrea Bolognani / Red Hat / Virtualization
On Wed, Jun 19, 2019 at 05:22:57PM +0200, Martin Kletzander wrote:
This is just a small script I wrote. It works the same way as all the libraries together which we are bundling, but with just JS. The only difference is that the day of the date is formatted as 2-digit, but this should be a bug in Firefox (at least locally for me) as the documentation states that type 'numeric' should actually not have leading zeros.
It will not be executed when the page is loaded locally.
It also uses the same proxy that query-rss uses. We can get rid of that, but we'd either need to have our own proxy, send a sss header to allow fetching the atom.xml or providing JSONP access to the RSS feed on virt-planet.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/index.html.in | 13 ------------- docs/js/main.js | 47 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+), 13 deletions(-)
diff --git a/docs/index.html.in b/docs/index.html.in index f593445d061d..fa75289cad0f 100644 --- a/docs/index.html.in +++ b/docs/index.html.in @@ -5,19 +5,6 @@ <script type="text/javascript" src="js/jquery-3.1.1.min.js"> </script> <script type="text/javascript" src="js/moment.min.js"> </script> <script type="text/javascript" src="js/jquery.rss.min.js"> </script> - - <script type="text/javascript"> - <!-- - jQuery(function($) { - $("#planet").rss("http://planet.virt-tools.org/atom.xml", { - ssl: true, - layoutTemplate: '<dl>{entries}</dl>', - entryTemplate: '<dt><a href="{url}">{title}</a></dt><dd>by {author} on {date}</li>', - dateFormat: 'DD MMM YYYY' - }) - }) - // --> - </script>
This code only runs on the index.html page which makes sense as that's where the RSS feed is displayed....
</head> <body class="index"> <h1>The virtualization API</h1> diff --git a/docs/js/main.js b/docs/js/main.js index e57b9f47ac11..07f79c7ff903 100644 --- a/docs/js/main.js +++ b/docs/js/main.js @@ -29,6 +29,53 @@ function pageload() {
simpleSearch = document.getElementById("simplesearch") simplesearch.addEventListener("submit", advancedsearch) + + docLoc = document.location; + if (docLoc.protocol != "file:" || + docLoc.origin != "null" || + docLoc.host !== "" || + docLoc.hostname !== "") { + fetchRSS() + } +}
...but unless I'm mis-reading something, this code runs on every single page on the site. I would have expected the fetcRSS() call to have been made from the <script> block in the index.html page.
+ +function fetchRSS() { + cb = "jsonpRSSFeedCallback" + window["jsonpRSSFeedCallback"] = function (data) { + if (data.responseStatus != 200) + return + entries = data.responseData.feed.entries + nEntries = Math.min(entries.length, 4) + + dl = document.createElement('dl') + + dateOpts = { day: 'numeric', month: 'short', year: 'numeric'} + + for (i = 0; i < nEntries; i++) { + entry = entries[i] + a = document.createElement('a') + a.href = entry.link + a.innerText = entry.title + + dt = document.createElement('dt') + dt.appendChild(a) + dl.appendChild(dt) + + date = new Date(entry.publishedDate) + datestr = date.toLocaleDateString('default', dateOpts) + + dd = document.createElement('dd') + dd.innerText = ` by ${entry.author} on ${datestr}` + + dl.appendChild(dd) + } + + planet.appendChild(dl); + }; + script = document.createElement("script") + script.src = "https://feedrapp.herokuapp.com/" + script.src += `?q=http%3A%2F%2Fplanet.virt-tools.org%2Fatom.xml&callback=${cb}` + document.body.appendChild(script); }
function advancedsearch(e) {
Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/js/main.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/js/main.js b/docs/js/main.js index 07f79c7ff903..668bf752b73d 100644 --- a/docs/js/main.js +++ b/docs/js/main.js @@ -28,7 +28,7 @@ function pageload() { advancedSearch.className = "advancedsearch" simpleSearch = document.getElementById("simplesearch") - simplesearch.addEventListener("submit", advancedsearch) + simpleSearch.addEventListener("submit", advancedsearch) docLoc = document.location; if (docLoc.protocol != "file:" || -- 2.21.0
On 19 Jun 2019, at 17:22, Martin Kletzander <mkletzan@redhat.com> wrote:
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/js/main.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/docs/js/main.js b/docs/js/main.js index 07f79c7ff903..668bf752b73d 100644 --- a/docs/js/main.js +++ b/docs/js/main.js @@ -28,7 +28,7 @@ function pageload() { advancedSearch.className = "advancedsearch"
simpleSearch = document.getElementById("simplesearch") - simplesearch.addEventListener("submit", advancedsearch) + simpleSearch.addEventListener("submit", advancedsearch)
Reviewed-by: Christophe de Dinechin <dinechin@redhat.com>
docLoc = document.location; if (docLoc.protocol != "file:" || -- 2.21.0
-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
On Wed, 2019-06-19 at 17:22 +0200, Martin Kletzander wrote:
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/js/main.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
In the subject: s/use/Use/ s/javascript/JavaScript/ Reviewed-by: Andrea Bolognani <abologna@redhat.com> -- Andrea Bolognani / Red Hat / Virtualization
Signed-off-by: Martin Kletzander <mkletzan@redhat.com> --- docs/Makefile.am | 6 +----- docs/index.html.in | 3 --- docs/js/jquery-3.1.1.min.js | 4 ---- docs/js/jquery.rss.min.js | 11 ----------- docs/js/moment.min.js | 7 ------- 5 files changed, 1 insertion(+), 30 deletions(-) delete mode 100644 docs/js/jquery-3.1.1.min.js delete mode 100644 docs/js/jquery.rss.min.js delete mode 100644 docs/js/moment.min.js diff --git a/docs/Makefile.am b/docs/Makefile.am index 0c899f958026..3e2cc39013f3 100644 --- a/docs/Makefile.am +++ b/docs/Makefile.am @@ -66,11 +66,7 @@ css = \ main.css javascript = \ - js/main.js \ - js/jquery-3.1.1.min.js \ - js/jquery.rss.min.js \ - js/moment.min.js - + js/main.js fonts = \ fonts/LICENSE.md \ diff --git a/docs/index.html.in b/docs/index.html.in index fa75289cad0f..a16a2e51d4be 100644 --- a/docs/index.html.in +++ b/docs/index.html.in @@ -2,9 +2,6 @@ <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> - <script type="text/javascript" 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On Wed, 2019-06-19 at 17:22 +0200, Martin Kletzander wrote: [...]
javascript = \ - js/main.js \ - js/jquery-3.1.1.min.js \ - js/jquery.rss.min.js \ - js/moment.min.js - + js/main.js
Please keep the list as javascript = \ js/main.js \ $(NULL) Smaller diff, both right now and in the future :) [...]
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> - <script type="text/javascript" src="js/jquery-3.1.1.min.js"> </script> - <script type="text/javascript" src="js/moment.min.js"> </script> - <script type="text/javascript" src="js/jquery.rss.min.js"> </script> </head>
You can get rid of <head> entirely now. With the above addressed, Reviewed-by: Andrea Bolognani <abologna@redhat.com> but please give Dan a chance to raise any concerns he might have before pushing :) -- Andrea Bolognani / Red Hat / Virtualization
On Wed, Jun 19, 2019 at 05:22:56PM +0200, Martin Kletzander wrote:
This is a response to all the discussions (mainly) other people had about all the JS code we're currently using, bundling, etc.
I would love some feedback on whether we can work on any of the solutions for getting rid of that external proxy. We would have to:
- either have our own proxy,
Ideally we'd not use any proxy imho
- send a 'Access-Control-Allow-Origin' header from the libvirt.org server to allow fetching the atom.xml or
Can you elaborate on this ? This is something we'd need to set on the libvirt.org httpd config, to allow it to access atom.xml from the planet.virt-toos.org server ? I can change libvirtd.org httpd as needed in general.
- be providing JSONP access to the RSS feed on virt-planet.
Again any more details on what this would imply ? The planet web server is just running centos7 httpd container in openshift: https://libvirt.org/git/?p=virttools-planet.git;a=blob;f=openshift/templates... Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
On Wed, Jun 19, 2019 at 06:24:36PM +0100, Daniel P. Berrangé wrote:
On Wed, Jun 19, 2019 at 05:22:56PM +0200, Martin Kletzander wrote:
This is a response to all the discussions (mainly) other people had about all the JS code we're currently using, bundling, etc.
I would love some feedback on whether we can work on any of the solutions for getting rid of that external proxy. We would have to:
- either have our own proxy,
Ideally we'd not use any proxy imho
I agree with that.
- send a 'Access-Control-Allow-Origin' header from the libvirt.org server to allow fetching the atom.xml or
Can you elaborate on this ? This is something we'd need to set on the libvirt.org httpd config, to allow it to access atom.xml from the planet.virt-toos.org server ?
The reason why we cannot fetch it directly is because of Same-origin policy [1] CORB (Cross-Origin Read Blocking). In order to avoid XSS (Cross-site scripting) the page is only allowed to access Same-Origin URIs (there are exceptions, I'll get to that). If a resource from different origin needs to be fetched, then the server side needs to be set up for CORS (Cross-Origin Resource Sharing [2]). With that the server sends the Access-Control-Allow-Origin (and other Access-Control-Allow-*) headers that will restrict what resources can the page load and how. For our use case it would be enough to set these, I believe (as more restrictive is better): Access-Control-Allow-Origin: "https://planet.virt-tools.org" Access-Control-Allow-Methods: "GET" On how to enable these, there is a lot of stuff on the net you can find, but the easiest info is probably here: https://enable-cors.org/server.html There are also some caveats or things people tend to forget (like enabling mod_headers on apache in order to make `Header set` directive work): https://awesometoast.com/cors/ This would be the easiest, cleanest, safest <add other superlatives> way to do that. The JS code would also be smaller and nicer, there would be no need for the condition on whether to call fetchRSS() or not as that would be controled by the server (nothing would be allowed when the file is opened locally and if someone uses a server on localhost (or even hosting our page somewhere else) they can select themselves if they want to allow this or not.
I can change libvirtd.org httpd as needed in general.
- be providing JSONP access to the RSS feed on virt-planet.
Again any more details on what this would imply ? The planet web server is just running centos7 httpd container in openshift:
https://libvirt.org/git/?p=virttools-planet.git;a=blob;f=openshift/templates...
This is one of the exceptions for which you do not need to setup CORS, JSONP is used to request JSON data in a certain way. It is what I am doing here, what jQuery's .json does, etc. Basically from JS you add <script src="<your_uri_here>?callback=<name>"/>, that is allowed to come from different origins, the server responds with a JS code that gets "evaluated" (too many details about this, I don't even know most of them, but basically you're not parsing it and you are hoping the server does not send you malicious JS). There would have to be a special code that exposes the atom.xml in the JSONP format, I don't think it's worth working on that, though. [1] https://en.wikipedia.org/wiki/Same-origin_policy [2] https://en.wikipedia.org/wiki/Cross-origin_resource_sharing
Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
On Thu, 2019-06-20 at 10:04 +0200, Martin Kletzander wrote:
On Wed, Jun 19, 2019 at 06:24:36PM +0100, Daniel P. Berrangé wrote:
On Wed, Jun 19, 2019 at 05:22:56PM +0200, Martin Kletzander wrote:
I would love some feedback on whether we can work on any of the solutions for getting rid of that external proxy. We would have to:
- either have our own proxy,
Ideally we'd not use any proxy imho
I agree with that.
Same here. With that in mind, this is a pre-existing issue with our blog roll implementation, that we're just making explicit with this change where it was hidden inside jquery.rss before, so I don't think it should be blocking this series which implements a strictly better solution than the current one. Let's get this merged, release v5.5.0 with no third-party JavaScript libraries, and then work on removing our reliance on feedrapp as a follow up. -- Andrea Bolognani / Red Hat / Virtualization
On Thu, Jun 20, 2019 at 10:29:10AM +0200, Andrea Bolognani wrote:
On Thu, 2019-06-20 at 10:04 +0200, Martin Kletzander wrote:
On Wed, Jun 19, 2019 at 06:24:36PM +0100, Daniel P. Berrangé wrote:
On Wed, Jun 19, 2019 at 05:22:56PM +0200, Martin Kletzander wrote:
I would love some feedback on whether we can work on any of the solutions for getting rid of that external proxy. We would have to:
- either have our own proxy,
Ideally we'd not use any proxy imho
I agree with that.
Same here.
With that in mind, this is a pre-existing issue with our blog roll implementation, that we're just making explicit with this change where it was hidden inside jquery.rss before, so I don't think it should be blocking this series which implements a strictly better solution than the current one.
Let's get this merged, release v5.5.0 with no third-party JavaScript libraries, and then work on removing our reliance on feedrapp as a follow up.
Yeah, it's going to take some work. I mainly misunderstood how it's supposed to work, so for now I am testing it locally to make sure we really know what to change and where. For now the v2 of the clean-up (with hopefully addressed all things pointed by the reviews) is here: https://www.redhat.com/archives/libvir-list/2019-June/msg00957.html I sent another version because I did some additional clean-ups and we can get a clear consensus on the state there. Thanks, Martin
On Thu, Jun 20, 2019 at 10:04:03AM +0200, Martin Kletzander wrote:
On Wed, Jun 19, 2019 at 06:24:36PM +0100, Daniel P. Berrangé wrote:
On Wed, Jun 19, 2019 at 05:22:56PM +0200, Martin Kletzander wrote:
This is a response to all the discussions (mainly) other people had about all the JS code we're currently using, bundling, etc.
I would love some feedback on whether we can work on any of the solutions for getting rid of that external proxy. We would have to:
- either have our own proxy,
Ideally we'd not use any proxy imho
I agree with that.
- send a 'Access-Control-Allow-Origin' header from the libvirt.org server to allow fetching the atom.xml or
Can you elaborate on this ? This is something we'd need to set on the libvirt.org httpd config, to allow it to access atom.xml from the planet.virt-toos.org server ?
The reason why we cannot fetch it directly is because of Same-origin policy [1] CORB (Cross-Origin Read Blocking). In order to avoid XSS (Cross-site scripting) the page is only allowed to access Same-Origin URIs (there are exceptions, I'll get to that). If a resource from different origin needs to be fetched, then the server side needs to be set up for CORS (Cross-Origin Resource Sharing [2]). With that the server sends the Access-Control-Allow-Origin (and other Access-Control-Allow-*) headers that will restrict what resources can the page load and how. For our use case it would be enough to set these, I believe (as more restrictive is better):
Access-Control-Allow-Origin: "https://planet.virt-tools.org" Access-Control-Allow-Methods: "GET"
As discussed on irc, we actually needed the reverse. planet.virt-tools.org web server needs to server these headers, allowing libvirt.org. I have now got the planet.virt-tools.org apache configured todo this correctly I believe, so please give it a try & let me know if anything else needs changing on either httpd server. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
participants (4)
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Andrea Bolognani -
Christophe de Dinechin -
Daniel P. Berrangé -
Martin Kletzander