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feature/allow documentMaxLength as callback function #5

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17 changes: 14 additions & 3 deletions lib/server.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,9 @@ ot.Server = (function (global) {
this.setDocumentMaxLength(null);
}

/**
* @param {number | (() => number) | null} maxLength
*/
Server.prototype.setDocumentMaxLength = function (maxLength) {
this.documentMaxLength = maxLength;
};
Expand All @@ -34,10 +37,18 @@ ot.Server = (function (global) {

// ... and apply that on the document.
var newDocument = operation.apply(this.document);

const maxLen =
typeof this.documentMaxLength === "function"
? this.documentMaxLength()
: this.documentMaxLength;

// ignore if exceed the max length of document
if(typeof this.documentMaxLength === 'number' &&
newDocument.length > this.documentMaxLength &&
newDocument.length > this.document.length) {
if (
typeof maxLen === "number" &&
newDocument.length > maxLen &&
newDocument.length > this.document.length
) {
return;
}
this.document = newDocument;
Expand Down