SingleFile: "Message length exceeded maximum allowed length" save failure in Chrome

[dstillman]

https://forums.zotero.org/discussion/85726/error-report-zetero-connector-failed-to-upload-webpage-snapshot

Doesn't happen if I remove the two large animations before saving.

Doesn't happen in Firefox, though deferred images — including those animations — also don't save.

[roshanshariff]

The same problem happens on https://franknielsen.github.io/IG/ on Chrome 99.0.4844.82 (when right clicking on the Zotero connector and selecting "Save to Zotero > Web Page with Snapshot". The connector version is 5.0.93. I get the following error in the connector log:

[JavaScript Error: "TypeError: Error in invocation of runtime.sendMessage(optional string extensionId, any message, optional object options, optional function callback): Message length exceeded maximum allowed length.
    at chrome-extension://ekhagklcjbdpajgpjgmbionohlpdbjgc/browser-polyfill.js:669:25
    at new Promise (<anonymous>)
    at Proxy.asyncFunctionWrapper (chrome-extension://ekhagklcjbdpajgpjgmbionohlpdbjgc/browser-polyfill.js:668:18)
    at Object.apply (chrome-extension://ekhagklcjbdpajgpjgmbionohlpdbjgc/browser-polyfill.js:696:28)
    at Object.callMethodWithCookies (chrome-extension://ekhagklcjbdpajgpjgmbionohlpdbjgc/messaging_inject.js:76:30)
    at Object._saveAsWebpage (chrome-extension://ekhagklcjbdpajgpjgmbionohlpdbjgc/inject/inject.js:555:43)
    at async Object.saveAsWebpage (chrome-extension://ekhagklcjbdpajgpjgmbionohlpdbjgc/inject/inject.js:476:12)" {file: "[object Object]"}]

It works fine in Firefox.

[gildas-lormeau]

In SingleFile, large messages are truncated in order to circumvent this issue. Here is below the code that achieve this:

in the content script:

https://github.com/gildas-lormeau/SingleFile/blob/16c06098e0b43097223793e0efa477549a4f4a39/src/extension/core/common/download.js#L40-L76

in the background script:

https://github.com/gildas-lormeau/SingleFile/blob/16c06098e0b43097223793e0efa477549a4f4a39/src/extension/core/bg/downloads.js#L96-L124