Adding the initial code
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25
LICENSE
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25
LICENSE
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BSD 2-Clause License
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Copyright (c) 2020, Elia el Lazkani
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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348
main.go
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348
main.go
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package main
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strings"
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flag "github.com/spf13/pflag"
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)
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// Create a list of constants to figure out
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// the command line flags and translate them
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// into uri flags.
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const (
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METRIC = 1 << iota
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USCS
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METERSECOND
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ZERO
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ONE
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TWO
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IGNOREUSERAGENT
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FOLLOWLINK
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NARROW
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QUIET
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SUPERQUIET
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NOCOLORS
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ADDFRAME
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MIDTRANSPARENCY
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TRANSPARENCY
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LOCATION
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LANGUAGE
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PNG
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VTWO
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)
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// Create a list of constants to define
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// uri switches by flag.
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const (
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MetricSwitch = "m"
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UscsSwitch = "u"
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MeterSecondSwitch = "M"
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ZeroSwitch = "0"
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OneSwitch = "1"
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TwoSwitch = "2"
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IgnoreUserAgentSwitch = "A"
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FollowLinkSwitch = "F"
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NarrowSwitch = "n"
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QuietSwitch = "q"
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SuperQuietSwitch = "Q"
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NoColorsSwitch = "T"
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AddFrameSwitch = "p"
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MidTransparencySwitch = "T"
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)
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// Define a command parameters struct.
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// This will hold all the configurations
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// set by the command line parameters provided.
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type cmdParams struct {
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Flags int
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TransparencyLevel int
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Location string
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Language string
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}
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// Create a method to figure out the command parameters
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// provided and translate them into uri parameters.
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// This will figure out if we need to download the PNG image
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// as well.
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func (cmdP *cmdParams) generateParamFormat() (string, bool, error) {
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var params []string
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var prefix []string
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var download bool
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prefix = append(prefix, "?")
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if cmdP.Flags&METRIC == METRIC {
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params = append(params, MetricSwitch)
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}
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if cmdP.Flags&USCS == USCS {
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params = append(params, UscsSwitch)
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}
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if cmdP.Flags&METERSECOND == METERSECOND {
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params = append(params, MeterSecondSwitch)
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}
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if cmdP.Flags&ZERO == ZERO {
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params = append(params, ZeroSwitch)
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}
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if cmdP.Flags&ONE == ONE {
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params = append(params, OneSwitch)
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}
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if cmdP.Flags&TWO == TWO {
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params = append(params, TwoSwitch)
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}
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if cmdP.Flags&IGNOREUSERAGENT == IGNOREUSERAGENT {
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params = append(params, IgnoreUserAgentSwitch)
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}
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if cmdP.Flags&FOLLOWLINK == FOLLOWLINK {
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params = append(params, FollowLinkSwitch)
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}
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if cmdP.Flags&NARROW == NARROW {
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params = append(params, NarrowSwitch)
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}
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if cmdP.Flags&QUIET == QUIET {
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params = append(params, QuietSwitch)
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}
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if cmdP.Flags&SUPERQUIET == SUPERQUIET {
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params = append(params, SuperQuietSwitch)
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}
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if cmdP.Flags&NOCOLORS == NOCOLORS {
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params = append(params, NoColorsSwitch)
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}
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if cmdP.Flags&ADDFRAME == ADDFRAME {
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params = append(params, AddFrameSwitch)
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}
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if cmdP.Flags&MIDTRANSPARENCY == MIDTRANSPARENCY {
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params = append(params, MidTransparencySwitch)
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}
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if cmdP.Flags&PNG == PNG {
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prefix[0] = "_"
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if cmdP.Flags&TRANSPARENCY == TRANSPARENCY && cmdP.TransparencyLevel >= 0 && cmdP.TransparencyLevel <= 100 {
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params = append(params, strings.Join([]string{"_transparency=", string(cmdP.TransparencyLevel)}, ""))
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}
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params = append(params, ".png")
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download = true
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}
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params = append(prefix, strings.Join(params, ""))
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return strings.Join(params, ""), download, nil
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}
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// TODO:
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// * Fix the description for help
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//
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// Create a function to parse all the command line parameters
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// provided and save them in the parameter struct.
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func flagParser(cmdP *cmdParams) {
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metric := flag.Bool("metric", false, "Display weather in metric")
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uscs := flag.Bool("uscs", false, "Display weather Imperial")
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meterSecond := flag.Bool("meter-second", false, "Display wind in m/s")
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zero := flag.Bool("zero", false, "Show the weather now")
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one := flag.Bool("one", false, "Show the weather for one day")
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two := flag.Bool("two", false, "Show the weather for two days")
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ignoreUserAgent := flag.Bool("ignore-user-agent", false, "Request ignoring the user agent")
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followLink := flag.Bool("follow-link", true, "Follow link redirect")
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narrow := flag.Bool("narrow", false, "Display weather in narrow view")
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quiet := flag.Bool("quiet", false, "Add the quiet flag")
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superQuiet := flag.Bool("super-quiet", false, "Add the super quiet flag")
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noColors := flag.Bool("no-colors", false, "Disable displaying colors")
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addFrame := flag.Bool("add-frame", false, "Add a frame to the output")
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midTransparency := flag.Bool("mid-transparency", false, "Enable mid-transparency (PNG only)")
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transparency := flag.Bool("transparency", false, "Enable transparency (PNG only)")
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png := flag.Bool("png", false, "Download a weather PNG image")
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v2 := flag.Bool("v2", false, "Use the v2 endpoint")
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transparencyLevel := flag.Int("transparency-level", 0, "Set transparency level between 0 and 100 ")
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location := flag.String("location", "", "Specify explicite location")
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language := flag.String("language", "", "Speficy explicite language")
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flag.Parse()
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if *metric {
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cmdP.Flags += METRIC
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}
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if *uscs {
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cmdP.Flags += USCS
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}
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if *meterSecond {
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cmdP.Flags += METERSECOND
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}
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if *zero {
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cmdP.Flags += ZERO
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}
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if *one {
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cmdP.Flags += ONE
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}
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if *two {
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cmdP.Flags += TWO
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}
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if *ignoreUserAgent {
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cmdP.Flags += IGNOREUSERAGENT
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}
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if *followLink {
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cmdP.Flags += FOLLOWLINK
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}
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if *narrow {
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cmdP.Flags += NARROW
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}
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if *quiet {
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cmdP.Flags += QUIET
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}
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if *superQuiet {
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cmdP.Flags += SUPERQUIET
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}
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if *noColors {
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cmdP.Flags += NOCOLORS
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}
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if *addFrame {
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cmdP.Flags += ADDFRAME
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}
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if *midTransparency {
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cmdP.Flags += MIDTRANSPARENCY
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}
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if *transparency {
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cmdP.Flags += TRANSPARENCY
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cmdP.TransparencyLevel = *transparencyLevel
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}
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if *png {
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cmdP.Flags += PNG
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}
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if *v2 {
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cmdP.Flags += VTWO
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}
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if *location != "" {
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cmdP.Flags += LOCATION
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cmdP.Location = *location
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}
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if *language != "" {
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cmdP.Flags += LANGUAGE
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cmdP.Language = *language
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}
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}
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// Create a function to generate the url that we'll be calling shortly.
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func generateURL(domain string, v2 bool, location string, lang string, format string) ([]string, map[string]string) {
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var link []string
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var headers = make(map[string]string)
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link = append(link, "https://")
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if v2 {
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link = append(link, "v2.")
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}
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link = append(link, domain, "/")
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if location != "" {
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link = append(link, location)
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}
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if format != "" {
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link = append(link, format)
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}
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if lang != "" {
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headers["Accept-Language"] = lang
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}
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return link, headers
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}
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// TODO:
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// * Create interfaces to print and save and migrate code to them
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//
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// Figure out if we need to print or download a PNG image
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// and call the server accordingly.
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func getWheather(url string, headers map[string]string, download bool) {
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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log.Fatal("Error reading request. ", err)
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}
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req.Header.Set("Content-Type", "text/plain; charset=utf-8")
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// I had to read the wttr.in code to figure this one out.
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// It wasn't Golang, it was 2 wasted hours that I won't be getting back.
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req.Header.Set("User-Agent", "curl")
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for key, value := range headers {
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req.Header.Add(key, value)
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}
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client := &http.Client{}
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client.Jar = nil
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resp, err := client.Do(req)
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if err != nil {
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log.Fatal("Error reading response. ", err)
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}
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defer resp.Body.Close()
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if download {
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splitURL := strings.Split(url, "/")
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filename := splitURL[len(splitURL)-1]
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f, err := os.Create(filename)
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if err != nil {
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return
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}
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defer f.Close()
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_, err = io.Copy(f, resp.Body)
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} else {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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log.Fatal("Error reading body. ", err)
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}
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fmt.Printf("%s\n", body)
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}
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}
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// This is the main function that glues everything together.
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func main() {
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var params cmdParams = cmdParams{}
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var domain string = "wttr.in"
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flagParser(¶ms)
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format, download, _ := params.generateParamFormat()
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link, headers := generateURL(domain, params.Flags&VTWO == VTWO, params.Location, params.Language, format)
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getWheather(strings.Join(link, ""), headers, download)
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}
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