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feat: Able to access flow global and states in templates
You can use templates in the Entity Id and data fields. When using
templates the top level is a property of the message object: msg.payload
would be {{payload}}. You can also access the flow, global and states
contexts {{flow.foobar}} {{global.something}}. For the states context
you can use the {{states.domain.entity_id}} to just get the state or
drill further down like
{{states.light.kitchen.attributes.friendly_name}}.
{{states.light.kitchen}} and {{states.light.kitchen.state}} are
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| /* | ||
| * Modified from https://github.com/node-red/node-red/blob/master/nodes/core/core/80-template.js | ||
| */ | ||
|
|
||
| const mustache = require('mustache'); | ||
| const selectn = require('selectn'); | ||
|
|
||
| function parseContext(key) { | ||
| var match = /^(flow|global)(\[(\w+)\])?\.(.+)/.exec(key); | ||
| if (match) { | ||
| var parts = {}; | ||
| parts.type = match[1]; | ||
| parts.store = match[3] === '' ? 'default' : match[3]; | ||
| parts.field = match[4]; | ||
| return parts; | ||
| } | ||
| return undefined; | ||
| } | ||
|
|
||
| /** | ||
| * Custom Mustache Context capable to collect message property and node | ||
| * flow and global context | ||
| */ | ||
|
|
||
| function NodeContext(msg, parent, nodeContext, serverName) { | ||
| this.msgContext = new mustache.Context(msg, parent); | ||
| this.nodeContext = nodeContext; | ||
| this.serverName = serverName; | ||
| } | ||
|
|
||
| NodeContext.prototype = new mustache.Context(); | ||
|
|
||
| NodeContext.prototype.lookup = function(name) { | ||
| // try message first: | ||
| try { | ||
| const value = this.msgContext.lookup(name); | ||
| if (value !== undefined) { | ||
| return value; | ||
| } | ||
|
|
||
| // try flow/global context: | ||
| const context = parseContext(name); | ||
| if (context) { | ||
| const type = context.type; | ||
| const store = context.store; | ||
| const field = context.field; | ||
| const target = this.nodeContext[type]; | ||
| if (target) { | ||
| return target.get(field, store); | ||
| } | ||
| } | ||
|
|
||
| // try state entities | ||
| const match = /^states\.(\w+\.\w+)(?:\.(.+))?/.exec(name); | ||
| if (match) { | ||
| const gHomeAssistant = this.nodeContext.global.get('homeassistant'); | ||
| const states = gHomeAssistant[this.serverName].states; | ||
| const entityId = match[1]; | ||
| const path = match[2] || 'state'; | ||
|
|
||
| return selectn(path, states[entityId]) || ''; | ||
| } | ||
|
|
||
| return ''; | ||
| } catch (err) { | ||
| throw err; | ||
| } | ||
| }; | ||
|
|
||
| NodeContext.prototype.push = function push(view) { | ||
| return new NodeContext( | ||
| view, | ||
| this.nodeContext, | ||
| this.msgContext, | ||
| this.serverName | ||
| ); | ||
| }; | ||
|
|
||
| module.exports = NodeContext; |
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