@pazznetwork/ngx-chat
Version:
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125 lines • 21.7 kB
JavaScript
import { jid as parseJid } from '@xmpp/jid';
import { xml } from '@xmpp/client';
// implements https://xmpp.org/extensions/xep-0004.html
export const FORM_NS = 'jabber:x:data';
function parseStringValue([valueEl]) {
return valueEl?.getText();
}
function parseMultipleStringValues(valueEls) {
return valueEls.map(el => parseStringValue([el]));
}
function parseJidValue([valueEl]) {
return valueEl && parseJid(valueEl.getText());
}
const valueParsers = {
fixed: parseStringValue,
boolean: ([valueEl]) => {
if (!valueEl) {
return false;
}
const value = valueEl.getText();
return value === '1' || value === 'true';
},
hidden: parseStringValue,
'jid-single': parseJidValue,
'jid-multi': (valueEls) => [
...new Set(valueEls.map(el => parseStringValue([el]))),
]
.map(jidStr => parseJid(jidStr)),
'list-single': parseStringValue,
'list-multi': parseMultipleStringValues,
'text-single': parseStringValue,
'text-private': parseStringValue,
'text-multi': parseMultipleStringValues,
};
export function parseForm(formEl) {
if (formEl.name !== 'x' || formEl.getNS() !== FORM_NS) {
throw new Error(`Provided element is not a form element: elementName=${formEl.name}, xmlns=${formEl.getNS()}, form=${formEl.toString()}`);
}
return {
type: formEl.attrs.type,
title: formEl.getChildText('title') ?? undefined,
instructions: formEl.getChildren('instructions').map(descEl => descEl.getText()),
fields: formEl.getChildren('field')
.map(fieldEl => {
const rawType = fieldEl.attrs.type;
const type = rawType in valueParsers ? rawType : 'text-single';
const { var: variable, label } = fieldEl.attrs;
let options;
if (type === 'list-single' || type === 'list-multi') {
options = fieldEl.getChildren('option').map(optionEl => ({
value: optionEl.getChildText('value'),
label: optionEl.attrs.label,
}));
}
return {
type,
variable,
label,
description: fieldEl.getChildText('desc') ?? undefined,
required: fieldEl.getChild('required') != null,
value: valueParsers[type](fieldEl.getChildren('value')),
options,
};
}),
};
}
export function getField(form, variable) {
return form.fields.find(field => field.variable === variable) ?? undefined;
}
export function setFieldValue(form, type, variable, value, createField = false) {
let field = form.fields
.find((f) => f.variable === variable);
if (field) {
if (field.type !== type) {
throw new Error(`type mismatch setting field value: variable=${field.variable}, field.type=${field.type}, requested type=${type}`);
}
field.value = value;
return;
}
if (createField) {
field = {
type,
variable,
value,
};
form.fields.push(field);
}
else {
throw new Error(`field for variable not found! variable=${variable}, type=${type}, value=${value}`);
}
}
function serializeTextualField(field) {
return field.value != null ? [field.value] : [];
}
function serializeTextualMultiField(field) {
return field.value;
}
const valueSerializers = {
fixed: serializeTextualField,
boolean: (field) => field.value != null ? [String(field.value)] : [],
hidden: serializeTextualField,
'jid-single': (field) => field.value ? [field.value.toString()] : [],
'jid-multi': (field) => field.value.map(jid => jid.toString()),
'list-single': serializeTextualField,
'list-multi': serializeTextualMultiField,
'text-single': serializeTextualField,
'text-private': serializeTextualField,
'text-multi': serializeTextualMultiField,
};
export function serializeToSubmitForm(form) {
const serializedFields = form.fields
.reduce((collectedFields, field) => {
const serializer = valueSerializers[field.type];
if (!serializer) {
throw new Error(`unknown field type: ${field.type}`);
}
const values = serializer(field);
if (field.variable != null && values.length > 0) {
collectedFields.push([field.variable, values]);
}
return collectedFields;
}, []);
return xml('x', { xmlns: FORM_NS, type: 'submit' }, ...serializedFields.map(([variable, values]) => xml('field', { var: variable }, ...values.map(value => xml('value', {}, value)))));
}
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["import { Element } from 'ltx';\nimport { jid as parseJid, JID } from '@xmpp/jid';\nimport { xml } from '@xmpp/client';\n\n// implements https://xmpp.org/extensions/xep-0004.html\n\nexport const FORM_NS = 'jabber:x:data';\n\nexport type FormType = 'form' | 'submit' | 'cancel' | 'result';\n\nexport interface Form {\n    type: FormType;\n    title?: string;\n    instructions: string[];\n    fields: FormField[];\n}\n\nexport type FieldType =\n    | 'fixed'\n    | 'boolean'\n    | 'hidden'\n    | 'jid-single'\n    | 'jid-multi'\n    | 'list-single'\n    | 'list-multi'\n    | 'text-single'\n    | 'text-private'\n    | 'text-multi';\n\nexport interface FieldValueType {\n    fixed: string;\n    boolean: boolean;\n    hidden: string;\n    'jid-single': JID;\n    'jid-multi': JID[];\n    'list-single': string;\n    'list-multi': string[];\n    'text-single': string;\n    'text-private': string;\n    'text-multi': string[];\n}\n\nexport type FormField =\n    | FixedFormField\n    | BooleanFormField\n    | TextualFormField\n    | JidSingleFormField\n    | JidMultiFormField\n    | ListSingleFormField\n    | ListMultiFormField\n    | TextMultiFormField;\n\nexport interface FixedFormField {\n    type: 'fixed';\n    variable?: string;\n    value: string;\n}\n\ninterface FormFieldBase<TFieldType extends FieldType> {\n    type: TFieldType;\n    variable: string;\n    label?: string;\n    required?: boolean;\n    description?: string;\n    value?: FieldValueType[TFieldType];\n}\n\nexport type BooleanFormField = FormFieldBase<'boolean'>;\nexport type TextualFormField = FormFieldBase<'hidden' | 'text-single' | 'text-private'>;\nexport type JidSingleFormField = FormFieldBase<'jid-single'>;\nexport type JidMultiFormField = FormFieldBase<'jid-multi'>;\nexport type TextMultiFormField = FormFieldBase<'text-multi'>;\n\ninterface ListFormField<TFieldType extends 'list-single' | 'list-multi'> extends FormFieldBase<TFieldType> {\n    options?: FieldOption[];\n}\n\nexport type ListSingleFormField = ListFormField<'list-single'>;\nexport type ListMultiFormField = ListFormField<'list-multi'>;\n\nexport interface FieldOption {\n    label?: string;\n    value: string;\n}\n\nfunction parseStringValue([valueEl]: Element[]): string {\n    return valueEl?.getText();\n}\n\nfunction parseMultipleStringValues(valueEls: Element[]): string[] {\n    return valueEls.map(el => parseStringValue([el]));\n}\n\nfunction parseJidValue([valueEl]: Element[]): JID {\n    return valueEl && parseJid(valueEl.getText());\n}\n\nconst valueParsers = {\n    fixed: parseStringValue,\n    boolean: ([valueEl]: Element[]): boolean => {\n        if (!valueEl) {\n            return false;\n        }\n        const value = valueEl.getText();\n        return value === '1' || value === 'true';\n    },\n    hidden: parseStringValue,\n    'jid-single': parseJidValue,\n    'jid-multi': (valueEls: Element[]): JID[] =>\n        [\n            ...new Set(\n                valueEls.map(el => parseStringValue([el])),\n            ),\n        ]\n            .map(jidStr => parseJid(jidStr)),\n    'list-single': parseStringValue,\n    'list-multi': parseMultipleStringValues,\n    'text-single': parseStringValue,\n    'text-private': parseStringValue,\n    'text-multi': parseMultipleStringValues,\n};\n\nexport function parseForm(formEl: Element): Form {\n    if (formEl.name !== 'x' || formEl.getNS() !== FORM_NS) {\n        throw new Error(`Provided element is not a form element: elementName=${formEl.name}, xmlns=${formEl.getNS()}, form=${formEl.toString()}`);\n    }\n\n    return {\n        type: formEl.attrs.type,\n        title: formEl.getChildText('title') ?? undefined,\n        instructions: formEl.getChildren('instructions').map(descEl => descEl.getText()),\n        fields: formEl.getChildren('field')\n            .map(fieldEl => {\n                const rawType = fieldEl.attrs.type as string;\n                const type = rawType in valueParsers ? rawType as keyof typeof valueParsers : 'text-single';\n                const {var: variable, label}: { var?: string, label?: string } = fieldEl.attrs;\n                let options: FieldOption[] | undefined;\n                if (type === 'list-single' || type === 'list-multi') {\n                    options = fieldEl.getChildren('option').map(optionEl => ({\n                        value: optionEl.getChildText('value'),\n                        label: optionEl.attrs.label,\n                    }));\n                }\n                return {\n                    type,\n                    variable,\n                    label,\n                    description: fieldEl.getChildText('desc') ?? undefined,\n                    required: fieldEl.getChild('required') != null,\n                    value: valueParsers[type](fieldEl.getChildren('value')),\n                    options,\n                } as FormField;\n            }),\n    };\n}\n\nexport function getField(form: Form, variable: string): FormField | undefined {\n    return form.fields.find(field => field.variable === variable) ?? undefined;\n}\n\nexport function setFieldValue<TFieldType extends FieldType, TValue extends FieldValueType[TFieldType]>(\n    form: Form,\n    type: TFieldType,\n    variable: string,\n    value: TValue,\n    createField = false,\n) {\n    let field = form.fields\n        .find((f) => f.variable === variable);\n\n    if (field) {\n        if (field.type !== type) {\n            throw new Error(`type mismatch setting field value: variable=${field.variable}, field.type=${field.type}, requested type=${type}`);\n        }\n        field.value = value;\n        return;\n    }\n\n    if (createField) {\n        field = {\n            type,\n            variable,\n            value,\n        } as FormField;\n        form.fields.push(field);\n    } else {\n        throw new Error(`field for variable not found! variable=${variable}, type=${type}, value=${value}`);\n    }\n}\n\nfunction serializeTextualField(field: TextualFormField | ListSingleFormField): string[] {\n    return field.value != null ? [field.value] : [];\n}\n\nfunction serializeTextualMultiField(field: ListMultiFormField | TextMultiFormField): string[] {\n    return field.value;\n}\n\nconst valueSerializers: Record<FieldType, (field: FormField) => string[]> = {\n    fixed: serializeTextualField,\n    boolean: (field: BooleanFormField) => field.value != null ? [String(field.value)] : [],\n    hidden: serializeTextualField,\n    'jid-single': (field: JidSingleFormField) => field.value ? [field.value.toString()] : [],\n    'jid-multi': (field: JidMultiFormField) => field.value.map(jid => jid.toString()),\n    'list-single': serializeTextualField,\n    'list-multi': serializeTextualMultiField,\n    'text-single': serializeTextualField,\n    'text-private': serializeTextualField,\n    'text-multi': serializeTextualMultiField,\n};\n\nexport function serializeToSubmitForm(form: Form): Element {\n    const serializedFields = form.fields\n        .reduce<[string, string[]][]>((collectedFields, field) => {\n            const serializer = valueSerializers[field.type];\n            if (!serializer) {\n                throw new Error(`unknown field type: ${field.type}`);\n            }\n\n            const values = serializer(field);\n\n            if (field.variable != null && values.length > 0) {\n                collectedFields.push([field.variable, values]);\n            }\n\n            return collectedFields;\n        }, []);\n\n    return xml('x', {xmlns: FORM_NS, type: 'submit'},\n        ...serializedFields.map(\n            ([variable, values]) =>\n                xml(\n                    'field',\n                    {var: variable},\n                    ...values.map(value => xml('value', {}, value)),\n                ),\n        ),\n    );\n}\n"]}