products: implement ListProducts, ProductByID

[odeke-em]

Fixes #38.

a) Implements ListProducts, which given a place (lat, lon) lists
available products
b) Implements ProductByID
c) Cleans up authentication problems that I noticed while testing
out a bunch of client methods. Added "Content-Type": "application/json"
headers for PUT and POST.

Exhibits:

• ProductByID:

func Example_client_ProductByID() {
        client, err :=
uber.NewClientFromOAuth2File(os.ExpandEnv("$HOME/.uber/credentials.json"))
        if err != nil {
                log.Fatal(err)
        }

        product, err :=
client.ProductByID("bc300c14-c30d-4d3f-afcb-19b240c16a13")
        if err != nil {
                log.Fatal(err)
        }

        fmt.Printf("The Product information: %#v\n", product)
}

Giving

The Product information: &uber.Product{UpfrontFareEnabled:true,
Capacity:2, ID:"bc300c14-c30d-4d3f-afcb-19b240c16a13",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-uberpool-2.png",
CashEnabled:false, Shared:true, ShortDescription:"uberPOOL",
DisplayName:"POOL", Description:"Share the ride, share the cost"}

• ListProducts:

func Example_client_ListProducts() {
        client, err :=
uber.NewClientFromOAuth2File(os.ExpandEnv("$HOME/.uber/credentials.json"))
        if err != nil {
                log.Fatal(err)
        }

        products, err := client.ListProducts(&uber.Place{
                Latitude:  38.8971,
                Longitude: -77.0366,
        })
        if err != nil {
                log.Fatal(err)
        }

        for i, product := range products {
                fmt.Printf("#%d: ID: %q Product: %#v\n", i, product.ID,
product)
        }
}

Produces

&uber.Product{UpfrontFareEnabled:true, Capacity:2,
ID:"bc300c14-c30d-4d3f-afcb-19b240c16a13",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-uberpool-2.png",
CashEnabled:false, Shared:true, ShortDescription:"uberPOOL",
DisplayName:"POOL", Description:"Share the ride, share the cost"}
&uber.Product{UpfrontFareEnabled:true, Capacity:4,
ID:"dee8691c-8b48-4637-b048-300eee72d58d",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-uberx.png",
CashEnabled:false, Shared:false, ShortDescription:"uberX",
DisplayName:"uberX", Description:"The low-cost Uber"}
&uber.Product{UpfrontFareEnabled:true, Capacity:6,
ID:"9ffa937e-7d2e-4bcf-bc2b-ffec4ef24380",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-uberxl2.png",
CashEnabled:false, Shared:false, ShortDescription:"uberXL",
DisplayName:"uberXL", Description:"Low-cost rides for large groups"}
&uber.Product{UpfrontFareEnabled:true, Capacity:4,
ID:"bc98a16f-ad72-41a3-8624-809ce654ac57",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-family.png",
CashEnabled:false, Shared:false, ShortDescription:"uberX + Car Seat",
DisplayName:"uberX + Car Seat", Description:"uberX + Car Seat"}
&uber.Product{UpfrontFareEnabled:true, Capacity:4,
ID:"a52a9012-d73e-4127-8440-f273cddfd307",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-black.png",
CashEnabled:false, Shared:false, ShortDescription:"BLACK CAR",
DisplayName:"UberBLACK", Description:"The Original Uber"}
&uber.Product{UpfrontFareEnabled:true, Capacity:4,
ID:"2a299c73-098d-47cd-b32c-825cb155f82a",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-family.png",
CashEnabled:false, Shared:false, ShortDescription:"BLACK CAR + Car
Seat", DisplayName:"BLACK CAR + Car Seat", Description:"BLACK CAR + Car
Seat"}
&uber.Product{UpfrontFareEnabled:true, Capacity:6,
ID:"4e6fd14c-3866-40f1-b173-f12aeb8fbbd0",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-suv.png",
CashEnabled:false, Shared:false, ShortDescription:"SUV",
DisplayName:"UberSUV", Description:"Room for everyone"}
&uber.Product{UpfrontFareEnabled:true, Capacity:6,
ID:"74766497-b951-4eae-98c9-a67d87e2c0c4",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-family.png",
CashEnabled:false, Shared:false, ShortDescription:"SUV + Car Seat",
DisplayName:"SUV + Car Seat", Description:"SUV + Car Seat"}
&uber.Product{UpfrontFareEnabled:false, Capacity:4,
ID:"89f38d7a-d184-4054-9f2e-6b57c94143d6",
PriceDetails:(*uber.PriceDetails)(0xc4201d8120),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-uberx.png",
CashEnabled:false, Shared:false, ShortDescription:"Wheelchair",
DisplayName:"Wheelchair", Description:"TAXI WITHOUT THE HASSLE"}
&uber.Product{UpfrontFareEnabled:false, Capacity:4,
ID:"f67c83fb-4668-42eb-9aa1-ab32e710c8bf",
PriceDetails:(*uber.PriceDetails)(nil),
ImageURL:"http://d1a3f4spazzrp4.cloudfront.net/car-types/mono/mono-taxi.png",
CashEnabled:false, Shared:false, ShortDescription:"TAXI",
DisplayName:"uberTAXI", Description:"Taxi without the hassle"}