feat: support for query parameter serialization style "deepObject" (#78)

* query param support deepObject

* fix

* remove stray comment

* Update src/client.jl

Co-authored-by: Tanmay Mohapatra <tanmaykm@gmail.com>

* Update src/json.jl

Co-authored-by: Tanmay Mohapatra <tanmaykm@gmail.com>

* Update src/server.jl

Co-authored-by: Tanmay Mohapatra <tanmaykm@gmail.com>

* fix

* fix

* fix location

---------

Co-authored-by: Tanmay Mohapatra <tanmaykm@gmail.com>

Author: vdayanand

src/client.jl

@@ -77,7 +77,7 @@ end
 
 function get_api_return_type(return_types::Dict{Regex,Type}, ::Nothing, response_data::String)
     # this is the async case, where we do not have the response code yet
-    # in such cases we look for the 200 response code 
+    # in such cases we look for the 200 response code
     return get_api_return_type(return_types, 200, response_data)
 end
 function get_api_return_type(return_types::Dict{Regex,Type}, response_code::Integer, response_data::String)
@@ -191,7 +191,7 @@ set_user_agent(client::Client, ua::String) = set_header(client, "User-Agent", ua
 Set the Cookie header to be sent with all API calls.
 """
 set_cookie(client::Client, ck::String) = set_header(client, "Cookie", ck)
-    
+
 """
     set_header(client::Client, name::String, value::String)
 
@@ -291,8 +291,26 @@ function set_header_content_type(ctx::Ctx, ctypes::Vector{String})
     return nothing
 end
 
-set_param(params::Dict{String,String}, name::String, value::Nothing; collection_format=",") = nothing
-function set_param(params::Dict{String,String}, name::String, value; collection_format=",")
+set_param(params::Dict{String,String}, name::String, value::Nothing; collection_format=",", style="form", location=:query, is_explode=default_param_explode(style)) = nothing
+# Choose the default collection_format based on spec.
+# Overriding it may not match the spec and there's no check.
+# But we do not prevent it to allow for wiggle room, since there are many interpretations in the wild over the loosely defined spec around this.
+# TODO: `default_param_explode` needs to be improved to handle location too (query, header, cookie...)
+function default_param_explode(style::String)
+    if style == "deepObject"
+        true
+    elseif style == "form"
+        true
+    else
+        false
+    end
+end
+function set_param(params::Dict{String,String}, name::String, value; collection_format=",", style="form", location::Symbol=:query, is_explode=default_param_explode(style))
+    deep_explode = style == "deepObject" && is_explode
+    if deep_explode
+        merge!(params, deep_object_serialize(Dict(name=>value)))
+        return nothing
+    end
     if isa(value, Dict)
         # implements the default serialization (style=form, explode=true, location=queryparams)
         # as mentioned in https://swagger.io/docs/specification/serialization/
@@ -789,7 +807,7 @@ function storefile(api_call::Function;
     folder::AbstractString = pwd(),
     filename::Union{String,Nothing} = nothing,
     )::Tuple{Any,ApiResponse,String}
-    
+
     result, http_response = api_call()
 
     if isnothing(filename)
@@ -828,4 +846,21 @@ function extract_filename(resp::Downloads.Response)::String
     return string("response", extension_from_mime(MIME(content_type_str)))
 end
 
+function deep_object_serialize(dict::Dict, parent_key::String = "")
+    parts = Pair[]
+    for (key, value) in dict
+        new_key = parent_key == "" ? key : "$parent_key[$key]"
+        if isa(value, Dict)
+            append!(parts, collect(deep_object_serialize(value, new_key)))
+        elseif isa(value, Vector)
+            for (i, v) in enumerate(value)
+                push!(parts, "$new_key[$(i-1)]"=>"$v")
+            end
+        else
+            push!(parts, "$new_key"=>"$value")
+        end
+    end
+    return Dict(parts)
+end
+
 end # module Clients

src/json.jl

@@ -34,41 +34,78 @@ function lower(o::T) where {T<:UnionAPIModel}
     end
 end
 
+struct StyleCtx
+    location::Symbol
+    name::String
+    is_explode::Bool
+end
+
+is_deep_explode(sctx::StyleCtx) = sctx.name == "deepObject" && sctx.is_explode
+
+function deep_object_to_array(src::Dict)
+    keys_are_int = all(key -> occursin(r"^\d+$", key), keys(src))
+    if keys_are_int
+        sorted_keys = sort(collect(keys(src)), by=x->parse(Int, x))
+        final = []
+        for key in sorted_keys
+            push!(final, src[key])
+        end
+        return final
+    else
+        src
+    end
+end
+
 to_json(o) = JSON.json(o)
 
-from_json(::Type{Union{Nothing,T}}, json::Dict{String,Any}) where {T} = from_json(T, json)
-from_json(::Type{T}, json::Dict{String,Any}) where {T} = from_json(T(), json)
-from_json(::Type{T}, json::Dict{String,Any}) where {T <: Dict} = convert(T, json)
-from_json(::Type{T}, j::Dict{String,Any}) where {T <: String} = to_json(j)
-from_json(::Type{Any}, j::Dict{String,Any}) = j
+from_json(::Type{Union{Nothing,T}}, json::Dict{String,Any}; stylectx=nothing) where {T} = from_json(T, json; stylectx)
+from_json(::Type{T}, json::Dict{String,Any}; stylectx=nothing) where {T} = from_json(T(), json; stylectx)
+from_json(::Type{T}, json::Dict{String,Any}; stylectx=nothing) where {T <: Dict} = convert(T, json)
+from_json(::Type{T}, j::Dict{String,Any}; stylectx=nothing) where {T <: String} = to_json(j)
+from_json(::Type{Any}, j::Dict{String,Any}; stylectx=nothing) = j
+from_json(::Type{Vector{T}}, j::Vector{Any}; stylectx=nothing) where {T} = j
+
+function from_json(::Type{Vector{T}}, json::Dict{String, Any}; stylectx=nothing) where {T}
+    if !isnothing(stylectx) && is_deep_explode(stylectx)
+        cvt = deep_object_to_array(json)
+        if isa(cvt, Vector)
+            return from_json(Vector{T}, cvt; stylectx)
+        else
+            return from_json(T, json; stylectx)
+        end
+    else
+        return from_json(T, json; stylectx)
+    end
+end
 
-function from_json(o::T, json::Dict{String,Any}) where {T <: UnionAPIModel}
-    return from_json(o, :value, json)
+function from_json(o::T, json::Dict{String,Any};stylectx=nothing) where {T <: UnionAPIModel}
+    return from_json(o, :value, json;stylectx)
 end
 
-from_json(::Type{T}, val::Union{String,Real}) where {T <: UnionAPIModel} = T(val)
-function from_json(o::T, val::Union{String,Real}) where {T <: UnionAPIModel}
+from_json(::Type{T}, val::Union{String,Real};stylectx=nothing) where {T <: UnionAPIModel} = T(val)
+function from_json(o::T, val::Union{String,Real};stylectx=nothing) where {T <: UnionAPIModel}
     o.value = val
     return o
 end
 
-function from_json(o::T, json::Dict{String,Any}) where {T <: APIModel}
+function from_json(o::T, json::Dict{String,Any};stylectx=nothing) where {T <: APIModel}
     jsonkeys = [Symbol(k) for k in keys(json)]
     for name in intersect(propertynames(o), jsonkeys)
-        from_json(o, name, json[String(name)])
+        from_json(o, name, json[String(name)];stylectx)
     end
     return o
 end
 
-function from_json(o::T, name::Symbol, json::Dict{String,Any}) where {T <: APIModel}
+function from_json(o::T, name::Symbol, json::Dict{String,Any};stylectx=nothing) where {T <: APIModel}
     ftype = (T <: UnionAPIModel) ? property_type(T, name, json) : property_type(T, name)
-    fval = from_json(ftype, json)
+    fval = from_json(ftype, json; stylectx)
     setfield!(o, name, convert(ftype, fval))
     return o
 end
 
-function from_json(o::T, name::Symbol, v) where {T <: APIModel}
+function from_json(o::T, name::Symbol, v; stylectx=nothing) where {T <: APIModel}
     ftype = (T <: UnionAPIModel) ? property_type(T, name, Dict{String,Any}()) : property_type(T, name)
+    atype = isa(ftype, Union) ? ((ftype.a === Nothing) ? ftype.b : ftype.a) : ftype
     if ftype === Any
         setfield!(o, name, v)
     elseif ZonedDateTime <: ftype
@@ -80,13 +117,15 @@ function from_json(o::T, name::Symbol, v) where {T <: APIModel}
     elseif String <: ftype && isa(v, Real)
         # string numbers can have format specifiers that allow numbers, ensure they are converted to strings
         setfield!(o, name, string(v))
+    elseif atype <: Real && isa(v, AbstractString)
+        setfield!(o, name, parse(atype, v))
     else
         setfield!(o, name, convert(ftype, v))
     end
     return o
 end
 
-function from_json(o::T, name::Symbol, v::Vector) where {T <: APIModel}
+function from_json(o::T, name::Symbol, v::Vector; stylectx=nothing) where {T <: APIModel}
     # in Julia we can not support JSON null unless the element type is explicitly set to support it
     ftype = property_type(T, name)
 
@@ -111,7 +150,7 @@ function from_json(o::T, name::Symbol, v::Vector) where {T <: APIModel}
         if (vtype <: Vector) && (veltype <: OpenAPI.UnionAPIModel)
             vec = veltype[]
             for vecelem in v
-                push!(vec, from_json(veltype(), :value, vecelem))
+                push!(vec, from_json(veltype(), :value, vecelem;stylectx))
             end
             setfield!(o, name, vec)
         elseif (vtype <: Vector) && (veltype <: OpenAPI.APIModel)
@@ -129,7 +168,7 @@ function from_json(o::T, name::Symbol, v::Vector) where {T <: APIModel}
     return o
 end
 
-function from_json(o::T, name::Symbol, ::Nothing) where {T <: APIModel}
+function from_json(o::T, name::Symbol, ::Nothing;stylectx=nothing) where {T <: APIModel}
     setfield!(o, name, nothing)
     return o
-end
+end

src/server.jl

@@ -3,7 +3,7 @@ module Servers
 using JSON
 using HTTP
 
-import ..OpenAPI: APIModel, ValidationException, from_json, to_json
+import ..OpenAPI: APIModel, ValidationException, from_json, to_json, deep_object_to_array, StyleCtx, is_deep_explode
 
 function middleware(impl, read, validate, invoke;
         init=nothing,
@@ -29,6 +29,36 @@ end
 ##############################
 # server parameter conversions
 ##############################
+struct Param
+    keylist::Vector{String}
+    value::String
+end
+
+function parse_query_dict(query_dict::Dict{String, String})::Vector{Param}
+    params = Vector{Param}()
+    for (key, value) in query_dict
+        keylist = replace.(split(key, "["), "]"=>"")
+        push!(params, Param(keylist, value))
+    end
+
+    return params
+end
+
+function deep_dict_repr(qp::Dict)
+    params = parse_query_dict(qp)
+    deserialized_dict = Dict{String, Any}()
+    for param in params
+        current = deserialized_dict
+        for part in param.keylist[1:end-1]
+            current = get!(current, part) do
+                return Dict{String, Any}()
+            end
+        end
+        current[param.keylist[end]] = param.value
+    end
+    return deserialized_dict
+end
+
 function get_param(source::Dict, name::String, required::Bool)
     val = get(source, name, nothing)
     if required && isnothing(val)
@@ -48,36 +78,50 @@ function get_param(source::Vector{HTTP.Forms.Multipart}, name::String, required:
     end
 end
 
-
-function to_param_type(::Type{T}, strval::String) where {T <: Number}
+function to_param_type(::Type{T}, strval::String; stylectx=nothing) where {T <: Number}
     parse(T, strval)
 end
 
-to_param_type(::Type{T}, val::T) where {T} = val
-to_param_type(::Type{T}, ::Nothing) where {T} = nothing
-to_param_type(::Type{String}, val::Vector{UInt8}) = String(copy(val))
-to_param_type(::Type{Vector{UInt8}}, val::String) = convert(Vector{UInt8}, copy(codeunits(val)))
-to_param_type(::Type{Vector{T}}, val::Vector{T}, _collection_format::Union{String,Nothing}) where {T} = val
+to_param_type(::Type{T}, val::T; stylectx=nothing) where {T} = val
+to_param_type(::Type{T}, ::Nothing; stylectx=nothing) where {T} = nothing
+to_param_type(::Type{String}, val::Vector{UInt8}; stylectx=nothing) = String(copy(val))
+to_param_type(::Type{Vector{UInt8}}, val::String; stylectx=nothing) = convert(Vector{UInt8}, copy(codeunits(val)))
+to_param_type(::Type{Vector{T}}, val::Vector{T}, _collection_format::Union{String,Nothing}; stylectx=nothing) where {T} = val
+to_param_type(::Type{Vector{T}}, json::Vector{Any}; stylectx=nothing) where {T} = [to_param_type(T, x; stylectx) for x in json]
+
+function to_param_type(::Type{Vector{T}}, json::Dict{String, Any}; stylectx=nothing) where {T}
+    if !isnothing(stylectx) && is_deep_explode(stylectx)
+        cvt = deep_object_to_array(json)
+        if isa(cvt, Vector)
+            return to_param_type(Vector{T}, cvt; stylectx)
+        end
+    end
+    error("Unable to convert $json to $(Vector{T})")
+end
 
-function to_param_type(::Type{T}, strval::String) where {T <: APIModel}
-    from_json(T, JSON.parse(strval))
+function to_param_type(::Type{T}, strval::String; stylectx=nothing) where {T <: APIModel}
+    from_json(T, JSON.parse(strval); stylectx)
 end
 
-function to_param_type(::Type{T}, json::Dict{String,Any}) where {T <: APIModel}
-    from_json(T, json)
+function  to_param_type(::Type{T}, json::Dict{String,Any}; stylectx=nothing) where {T <: APIModel}
+    from_json(T, json; stylectx)
 end
 
-function to_param_type(::Type{Vector{T}}, strval::String, delim::String) where {T}
+function to_param_type(::Type{Vector{T}}, strval::String, delim::String; stylectx=nothing) where {T}
     elems = string.(strip.(split(strval, delim)))
-    return map(x->to_param_type(T, x), elems)
+    return map(x->to_param_type(T, x; stylectx), elems)
 end
 
-function to_param_type(::Type{Vector{T}}, strval::String) where {T}
+function to_param_type(::Type{Vector{T}}, strval::String; stylectx=nothing) where {T}
     elems = JSON.parse(strval)
-    return map(x->to_param_type(T, x), elems)
+    return map(x->to_param_type(T, x; stylectx), elems)
 end
 
-function to_param(T, source::Dict, name::String; required::Bool=false, collection_format::Union{String,Nothing}=",", multipart::Bool=false, isfile::Bool=false)
+function to_param(T, source::Dict, name::String; required::Bool=false, collection_format::Union{String,Nothing}=",", multipart::Bool=false, isfile::Bool=false, style::String="form", is_explode::Bool=true, location=:query)
+    deep_explode = style == "deepObject" && is_explode
+    if deep_explode
+        source = deep_dict_repr(source)
+    end
     param = get_param(source, name, required)
     if param === nothing
         return nothing
@@ -86,10 +130,13 @@ function to_param(T, source::Dict, name::String; required::Bool=false, collectio
         # param is a Multipart
         param = isfile ? param.data : String(param.data)
     end
+    if deep_explode
+        return to_param_type(T, param; stylectx=StyleCtx(location, style, is_explode))
+    end
     if T <: Vector
-        return to_param_type(T, param, collection_format)
+        to_param_type(T, param, collection_format)
     else
-        return to_param_type(T, param)
+        to_param_type(T, param)
     end
 end
 

test/client/param_serialize.jl

@@ -0,0 +1,45 @@
+using OpenAPI.Clients: deep_object_serialize
+
+@testset "Test deep_object_serialize" begin
+    @testset "Single level object" begin
+        dict = Dict("key1" => "value1", "key2" => "value2")
+        expected = Dict("key1" => "value1", "key2" => "value2")
+        @test deep_object_serialize(dict) == expected
+    end
+
+    @testset "Nested object" begin
+        dict = Dict("outer" => Dict("inner" => "value"))
+        expected = Dict("outer[inner]" => "value")
+        @test deep_object_serialize(dict) == expected
+    end
+
+    @testset "Deeply nested object" begin
+        dict = Dict("a" => Dict("b" => Dict("c" => Dict("d" => "value"))))
+        expected = Dict("a[b][c][d]" => "value")
+        @test deep_object_serialize(dict) == expected
+    end
+
+    @testset "Multiple nested objects" begin
+        dict = Dict("a" => Dict("b" => "value1", "c" => "value2"))
+        expected = Dict("a[b]" => "value1", "a[c]" => "value2")
+        @test deep_object_serialize(dict) == expected
+    end
+
+    @testset "Dictionary represented array" begin
+        dict = Dict("a" => ["value1", "value2"])
+        expected = Dict("a[0]" => "value1", "a[1]" => "value2")
+        @test deep_object_serialize(dict) == expected
+    end
+
+    @testset "Mixed structure" begin
+        dict = Dict("a" => Dict("b" => "value1", "c" => ["value2", "value3"]))
+        expected = Dict("a[b]" => "value1", "a[c][0]" => "value2", "a[c][1]" => "value3")
+        @test deep_object_serialize(dict) == expected
+    end
+
+    @testset "Blank values" begin
+        dict = Dict("a" => Dict("b" => "", "c" => ""))
+        expected = Dict("a[b]" => "", "a[c]" => "")
+        @test deep_object_serialize(dict) == expected
+    end
+end

test/client/runtests.jl

@@ -11,6 +11,9 @@ include("openapigenerator_petstore_v3/runtests.jl")
 
 function runtests(; skip_petstore=false, test_file_upload=false)
     @testset "Client" begin
+        @testset "deepObj query param serialization" begin
+            include("client/param_serialize.jl")
+        end
         @testset "Utils" begin
             test_longpoll_exception_check()
             test_request_interrupted_exception_check()
@@ -52,4 +55,4 @@ function run_openapigenerator_tests(; test_file_upload=false)
     end
 end
 
-end # module OpenAPIClientTests
+end # module OpenAPIClientTests