add option to delete files

res/include/script/file_viewer/EditWindow.js

@@ -0,0 +1,52 @@
+function EditWindow() {
+	this.visible = false
+	this.modal   = new Modal(
+		document.getElementById("file_viewer"),
+		() => { this.toggle() },
+		"Edit File", "1000px", "auto",
+	)
+
+	let clone = document.getElementById("tpl_edit_file").content.cloneNode(true)
+	clone.querySelector(".btn_delete_file").addEventListener("click", () => { this.deleteFile() })
+	this.modal.setBody(clone)
+
+	this.btnEdit = document.getElementById("btn_edit")
+	this.btnEdit.addEventListener("click", () => { this.toggle() })
+}
+
+EditWindow.prototype.toggle = function() {
+	if (this.visible) {
+		this.modal.close()
+		this.btnEdit.classList.remove("button_highlight")
+		this.visible = false
+	} else if (!this.visible && this.file.can_edit) {
+		this.modal.open()
+		this.btnEdit.classList.add("button_highlight")
+		this.visible = true
+	}
+}
+
+EditWindow.prototype.setFile = function(file) {
+	this.file = file
+	this.modal.setTitle("Editing "+file.name)
+
+	if (this.file.can_edit) {
+		this.btnEdit.style.display = ""
+	} else {
+		this.btnEdit.style.display = "none"
+	}
+}
+
+EditWindow.prototype.deleteFile = function() {
+	if (!confirm("Are you sure you want to delete '"+this.file.name+"'?")) {
+		return
+	}
+
+	fetch(
+		this.file.get_href, {method: "DELETE"}
+	).then(resp => {
+		this.modal.setBody(document.createTextNode("This file has been deleted"))
+	}).catch(err => {
+		alert("Error! Could not delete file")
+	})
+}