symfony assertions raw data validation with if/else statement - php

Question

I have a such json:
{
"id":1,
"name":"some name",
"decorations":[
{
"id":1,
"options":[
{
"type":"color",
"label":"Color",
"items":[
{
"label":"Green shades",
"color_group":{
"shade":"green",
"name":"Green"
},
"colors":[
{
"rgb":"249,249,249",
"hex":"#FBFBFB"
},
{
"rgb":"249,249,250",
"hex":"#FBFBFF"
}
]
},
{
"label":"White shades",
"color_group":{
"shade":"white",
"name":"White"
},
"colors":[
{
"rgb":"255,255,255",
"hex":"#FFFFFF"
}
]
}
]
},
{
"type":"position",
"label":"Position",
"items":[
{
"label":"Front"
},
{
"label":"Back"
}
]
}
]
}
]
}
which I want to validate, rules are:
id, name, decorators required
each decorator should have id and options
each option should have type, label and items. each option has few types, all of them has same structure of each item except of a color type
so each item should have label, and in case of color option each item should have color_group, colors
- where color_group should have 'shade' and name
- each color in colors should have rgb and hex
I want to use symfony assertions to validate that json, and all is more or less straightforward except that rule where depends on a type I have different rules... I do not know how to do it right, I found that I can use expression or callback assertion but in both case it showing how to validate object but not a array.
Here is what I have:
new Assert\Collection(
[
'allowExtraFields' => true,
'fields' => [
'id' => [
new Assert\Required(),
new Assert\Type(['type' => 'integer']),
],
'decorations' => new Assert\All(
[
new Assert\Collection(
[
'allowExtraFields' => true,
'fields' => [
'id' => [
new Assert\Required(),
new Assert\Type(['type' => 'integer']),
],
'options' => new Assert\All(
[
'type' => [
new Assert\Required(),
new Assert\Type(['type' => 'string']),
],
'label' => [
new Assert\Required(),
new Assert\Type(['type' => 'string']),
],
'items' => new Assert\All(
[
new Assert\Collection(
[
'allowExtraFields' => true,
'fields' => [
// label is required for all types
'label' => [
new Assert\Required(),
new Assert\Type(['type' => 'string']),
]
// here I should add constraints for colors, if type equal to "color", but do not know how to make that if/else statement...
]
]
)
]
)
]
)
]
]
)
]
)
]
]
);